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Today, March 24, 2021, marks 20 years since Mac OS X went on sale, and Apple's Mac software has gone through many changes over the course of the last two decades, but it was with Mac OS X that. On your Mac, choose Apple menu System Preferences, then click Energy Saver. Click Schedule in the bottom-right corner, then select the options you want to use. Schedule a startup or wake time for your Mac: Select the 'Start up or wake' checkbox. Choose a day or group of days from the pop-up menu, then enter a time.

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PC Energy Savings Guideline

1. Officially, the operating system that was available on that Mac at the time that you bought it is the oldest version of macOS that can run on that Mac. It's likely that an older OS won't include.
2. For pre-late-2007 MacBooks and Mac Minis with core 2 duo: They support up to 3 GB. You can put 2Gb+1Gb or you can put 2x2Gb for faster dual channel operation but the OS will only detect and use 3 Gb.
3. Verity Confidential Cloud Agent for Mac Installation Guide Agent Version 1.6 - 1.7, 2.3, 2.5 September 3, 2020 (Updated April 9, 2021).

UH has over 10,000 networked personal computers to support teaching, research and administration. PCs and other electronic office equipment, such as printers and scanners, collectively consume significant amounts of energy. Fortunately, there are ways that personal computers users can conserve energy and save money, without major impact to operations.

A desktop personal computer with LCD monitor uses about 1080 kWh per year if left on 24/7 and would cost UH $225* to run. (*Energy rates are expected to increase.) Turning off the computer when you leave for the day, would save about 65%. UH could save $1.57 million a year in energy costs (based on 10,000 units at $0.23 per kWh). Energy estimates depend on computer specifications, duration of use, as well as type of use.

(adapted from Saving Energy, http://michaelbluejay.com/electricity/computers.html)

Modern computers are designed with energy-saving components and come with advanced power management. Power management, standard in Windows and Mac operating systems, can put inactive monitors and computer systems (CPU, hard drive, etc.) into low-power 'sleep' mode. Moving the mouse or touching the keyboard 'wakes' up the monitor and computer in seconds. Power saving settings can be adjusted to meet your needs.

A desktop computer when shut down uses 3-5 watts; when it is idle, it uses an average of 89 watts. A laptop computer when shut down uses 3 watts; when it is idle, it uses 15-25 watts.* By putting your computer to sleep when it's inactive, considerable energy savings can be realized.

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*from Dell on Dell: Energy Efficiency

• Turn off computers when you are done for the day.*

*Exceptions: if software updates and backups are done after work hours, consult with your departmental IT staff. Leave your computer on if you need to access it remotely.

• Set power management options to automatically put your computer to sleep/standby mode after 15 minutes or less of inactivity.*

* If nothing else, set power management for monitors. Set hard drive power management after consulting with your departmental IT staff as applications may be affected.
Recommendations for Power Management
(adapted from MIT for use at UH, http://web.mit.edu/ist/initiatives/it-energy/guidelines.html)

Configuring Power Management for Personal Computers http://www.hawaii.edu/askus/926

WINDOWS XP (Start > Control Panel > Power Options)
Desktop Computers:
Monitor - turn off after 10 minutes of inactivity
Hard disk - turn off after 5 minutes of inactivity
System standby - after 1 hour of inactivity
System hibernation - never
Laptop Computers (plugged in):
Turn off monitor - after 10 mins
Turn off hard disks - after 20 mins
System standby - after 1 hour
System hibernates - never
Laptop Computers (on battery):
Turn off monitor - after 5 mins
Turn off hard disks - after 10 mins
System standby - after 1 hour
System hibernates - after 2 hours
WINDOWS VISTA (Start > Control Panel > System and Maintenance > Power Options)
Desktop Computers:
Monitor - turn off after 10 minutes of inactivity
Hard disk - turn off after 5 minutes of inactivity
System standby - after 1 hour of inactivity
System hibernation - never
Laptop Computers (on battery):
Display - turn off after 5 minutes of inactivity
Put computer to sleep - after 15 minutes of inactivity

Hard disk - turn off after 5 minutes of inactivity
Laptop Computers (plugged in):
Display - turn off after 10 minutes of inactivity
Put computer to sleep - after 1 hour of inactivity

Hard disk - turn off after 20 minutes of inactivity
MAC OS (System Preferences > Energy Saver)

Desktop Computers:
Put the computer to sleep when it is inactive for: 1 hour
Put the display to sleep when it is inactive for: 15 minutes
Do not check the box for 'Put the hard disk to sleep when possible'
Laptop Computers (on power adapter):
Put the computer to sleep when it is inactive for: 1 hour
Put the display to sleep when the computer is inactive for: 15 minutes
Do not check the box for 'Put the hard disk to sleep when possible'
Laptop Computers (on battery):
Put the computer to sleep when it is inactive for: 15 minutes
Put the display to sleep when the computer is inactive for: 5 minutes
Check the box for 'Put the hard disk to sleep when possible'

• Avoid using screen savers.

They waste energy and do not save the screen. A screen saver requires that the PC and monitor be at full power. Some graphics-intensive screen savers may burn twice as much energy. Screen savers may prevent the computer from entering sleep mode. You only save energy if the monitor goes dark by going to sleep. Modern CRT and LCD screens are not prone to 'burn in' from phosphor burn as older monitors.

• For desktop computers, use LCDs instead of CRT monitors.

LCDs use less energy (30-35 watts) than CRT monitors (80 watts).

• Use a laptop computer, if possible. They are more energy-efficient than desktop computers.

A desktop computer when idle uses an average of 89 watts. A laptop when idle uses 15-25 watts. (Dell on Dell: Energy Efficiency)

Please consider your work requirements and budget when purchasing computers. Laptops cost more, have less expansion/upgrade options, and are more prone to theft/security issues than desktop computers.

• Purchase Energy Star-rated computers when possible.

• Turn off computers when you are done for the day.*

*Exceptions: if software updates and backups are done after work hours, consult with your departmental IT staff. Leave your computer on if you need to access it remotely.

• Set power management options to automatically put your computer to sleep/standby mode after 15 minutes or less of inactivity.*

* If nothing else, set power management for monitors. Set hard drive power management after consulting with your departmental IT staff as applications may be affected.
Recommendations for Power Management
(adapted from MIT for use at UH, http://web.mit.edu/ist/initiatives/it-energy/guidelines.html)

Configuring Power Management for Personal Computers http://www.hawaii.edu/askus/926

WINDOWS XP (Start > Control Panel > Power Options)
Desktop Computers:
Monitor - turn off after 10 minutes of inactivity
Hard disk - turn off after 5 minutes of inactivity
System standby - after 1 hour of inactivity
System hibernation - never
Laptop Computers (plugged in):
Turn off monitor - after 10 mins
Turn off hard disks - after 20 mins
System standby - after 1 hour
System hibernates - never
Laptop Computers (on battery):
Turn off monitor - after 5 mins
Turn off hard disks - after 10 mins
System standby - after 1 hour
System hibernates - after 2 hours
WINDOWS VISTA (Start > Control Panel > System and Maintenance > Power Options)
Desktop Computers:
Monitor - turn off after 10 minutes of inactivity
Hard disk - turn off after 5 minutes of inactivity
System standby - after 1 hour of inactivity
System hibernation - never
Laptop Computers (on battery):
Display - turn off after 5 minutes of inactivity
Put computer to sleep - after 15 minutes of inactivity

Hard disk - turn off after 5 minutes of inactivity
Laptop Computers (plugged in):
Display - turn off after 10 minutes of inactivity
Put computer to sleep - after 1 hour of inactivity

Hard disk - turn off after 20 minutes of inactivity
MAC OS (System Preferences > Energy Saver)

Desktop Computers:
Put the computer to sleep when it is inactive for: 1 hour
Put the display to sleep when it is inactive for: 15 minutes
Do not check the box for 'Put the hard disk to sleep when possible'
Laptop Computers (on power adapter):
Put the computer to sleep when it is inactive for: 1 hour
Put the display to sleep when the computer is inactive for: 15 minutes
Do not check the box for 'Put the hard disk to sleep when possible'
Laptop Computers (on battery):
Put the computer to sleep when it is inactive for: 15 minutes
Put the display to sleep when the computer is inactive for: 5 minutes
Check the box for 'Put the hard disk to sleep when possible'

• Avoid using screen savers.

They waste energy and do not save the screen. A screen saver requires that the PC and monitor be at full power. Some graphics-intensive screen savers may burn twice as much energy. Screen savers may prevent the computer from entering sleep mode. You only save energy if the monitor goes dark by going to sleep. Modern CRT and LCD screens are not prone to 'burn in' from phosphor burn as older monitors.

• For desktop computers, use LCDs instead of CRT monitors.

LCDs use less energy (30-35 watts) than CRT monitors (80 watts).

• Use a laptop computer, if possible. They are more energy-efficient than desktop computers.

A desktop computer when idle uses an average of 89 watts. A laptop when idle uses 15-25 watts. (Dell on Dell: Energy Efficiency)

Please consider your work requirements and budget when purchasing computers. Laptops cost more, have less expansion/upgrade options, and are more prone to theft/security issues than desktop computers.

• Purchase Energy Star-rated computers when possible.

Energy Star is a joint program of the US Environmental Protection Agency and the Department of Energy to help us save money and protect the environment through energy efficient products and practices. From July 20, 2007, Energy Star's new specifications for computers went into effect. Only the most energy-efficient computers will qualify for the Energy Star label.
http://www.energystar.gov/index.cfm?fuseaction=find_a_product.showProductGroup&pgw_code=CO

(adapted from http://www.energystar.gov/index.cfm?c=power_mgt.pr_power_mgt_faq)

1. Why should I use power management features?

You can save up to $75 or more per computer by activating system standby or sleep mode features. You save energy, reduce carbon dioxide emissions and help prevent global warming.

2. My screen saver is activated. Do I need to activate power management features?

If you want to use your screen saver in conjunction with monitor power management, set the screen saver 'wait time' to less than the period of time after which the monitor enters sleep mode. If your screen saver appears but your monitor never enters sleep mode, your screen saver may be the culprit: try disabling it.

3. Do computers and monitors use more energy with power management features activated due to power surges when cycling on and off? Seicosoft finestres 95 mac os.

In reality, the small surge of power created when some devices are turned on is vastly smaller than the energy used by running the device when it is not needed.

4. Can sleep features wear out hardware by forcing the computer to turn on and off several times a day?

'Modern computers are designed to handle 40,000 on-off cycles before failure, and you're not likely to approach that number during the average computer's five- to seven-year life span. In fact, IBM and Hewlett Packard encourage their own employees to turn off idle computers, and some studies indicate it would require on-off cycling every five minutes to harm a hard drive.'

• Your computer will not go to sleep mode if programs are running in the background.


• If your computer is too old (> 5 years old), it may not have power management capabilities.


• If you run special applications which require the computer not to be in sleep mode, please do NOT turn on power management for the hard drive.


• See case studies of businesses, universities and schools that have activated system standby.
  http://www.energystar.gov/index.cfm?c=power_mgt.pr_power_mgt_ss#uwi

Edison for Windows, free for individuals to manage their own PC, free from Verdiem for Windows 2000/XP/Vista/7
Edison for Windows
EZ Wizard tool for individuals to manage their own PC, free from EPA, for Windows 2000 and XP
http://www.energystar.gov/index.cfm?c=power_mgt.pr_power_mgt_ez_wiz

EZ GPO network management tool for system/network administrators to centrally manage computers, free from EPA
http://www.energystar.gov/index.cfm?c=power_mgt.pr_power_mgt_ez_gpo

Energy Star
http://www.energystar.gov/

MIT
http://web.mit.edu/ist/initiatives/it-energy/guidelines.html

Ohio State University
http://www.ohio.edu/sustainability/greenpc/

Microsoft
http://www.microsoft.com/whdc/archive/winpowmgmt.mspx

Saving Electricity
http://michaelbluejay.com/electricity/computers.html

Climate Savers
http://www.climatesaverscomputing.org/learn/energy-saver-guide/

Save and Go Green: Computer Energy Saving
http://www.paystolivegreen.com/2008/08/save-and-go-green-computer-energy-saving/

10 Computer Energy Saving Tips: Go Green
http://computers.toptenreviews.com/economy/10-computer-energy-saving-tips-go-green.htm

The classic OS X 10.12, or rather macOS upgrade, introduced tons of features anyone would still want on their Mac. Why? Because, it's well-tested and secure. Now we'll take a quick look at the legendary macOS Sierra upgrade. (In case you want to upgrade your Mac to macOS 10.13 High Sierra, check out this guide.)

Interestingly, it first brought Siri to your Mac. This is great news for everyone who's already used to her help on iOS. Then, there's Watch unlocking for Mac, there's one-click Apple Pay, tabs in apps, and cross-device copypasting. Just to name a few.

So, if you were on the fence about upgrading to Sierra, and in fact, any newer OS, go right ahead. Your Mac deserves a refreshment.

How to upgrade macOS: Sierra 10.12 compatibility list

As with the previous versions, macOS Sierra is available for a limited list of Mac models.
Here are the models of Macs that are compatible with macOS 10.12 and can upgrade to Sierra:

Does order matter when you upgrade macOS?

If your current operating system is OS X Lion (10.7), you can skip a few versions, and upgrade directly to macOS High Sierra. To upgrade to Sierra from, say, Mavericks, you'll have to consequently upgrade to Yosemite and then to El Capitan first.

Check Your macOS for Sierra Compatibility

These OS versions can upgrade to Sierra:

• OS X Mountain Lion v10.8
• OS X Mavericks v10.9
• OS X Yosemite v10.10
• OS X El Capitan v10.11

Here's how to find out which OS version you're running now:

1. Click Apple icon in the top left corner.
2. Choose About this Mac.
3. There you have it, in capital letters.

Memory (RAM): 2 GB (preferably 4 GB)
Sierra is pretty lightweight, so you only need 2 GB of RAM to upgrade. Cool, eh?

Disk space: 8 GB of free space on drive.
In the same About this Mac menu select 'Storage' tab. In front of the multi-colored bar, you will see the phrase, 'X.XX GB free out of XX.XX GB.' If you don't have at least 8 GB of free space, you should delete some old files.

Before you update macOS, don't forget to:

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Clean up your Mac

This is essential if you want a fast and effortless update, and glitchless work of your new macOS. And it's also pretty easy. To give your Mac a cleanup, you need to get rid of system junk, uninstall extra apps, and clean some old caches. If that sounds like a lot of work, you can get a Mac cleaner like CleanMyMac for the job.

How to update your Mac: Clean it up first

1. Launch it.
2. Hit Scan to find all the extra files you can delete.
3. Press Run.

As you can see, I have 8.56 GB worth of caches, obsolete language files, broken downloads. You'll feel great getting rid of them.
That will give your Mac a basic system cleanup, but CleanMyMac is going to come in handy after the update as well. It monitors your Mac's health, helps you speed up the system and remove unnecessary apps (Trashing doesn't fully uninstall apps, by the way).

Back up your Mac

This is basic common sense before any Mac software update you'd like to undertake. Why? Well, because sometimes updates happen less smoothly than you'd like them to. To make sure you have all your information and files saved up neatly, you need a backup. To back up your Mac, you need to activate Time Machine.

• Open your Applications folder.
• Choose Time Machine.
• 'Select Backup Disk…'
  Note: You may need to first choose to 'Set Up Time Machine.'
• Choose where you'd like to store your backup.
• Both an external drive or an Airport Time Capsule fit.

• Switch the toggle on the left, from 'OFF' to 'ON.' Right beneath the name of your storage device, you'll see 'Oldest backup,' 'Latest backup,' and 'Next backup' — Your backup will begin within 5 minutes. To speed it up, click the arrow clock icon next to the Date & Time at the top-right of the menu bar and select 'Back Up Now.'

How to download macOS Sierra (or newer macOS) and install it

macOS Sierra is increasingly becoming a relic. Since 2020, the newest available macOS version is Big Sur. But it all comes down to hardware. Your Mac can only upgrade to the latest version its hardware can support. If your Mac is from around 2012 it can update as high up as to macOS Catalina. If your Mac is from 2010 or older, its limit is macOS High Sierra.

To download any new macOS and install it you'll need to do the next:
1. Open System Preferences.. in the  Apple menu.
2. Click on Software Updates.
On top of the list you'll see the latest macOS version your Mac can download. In our case, it's macOS Big Sur.

Another way to do it is via the Mac App Store.

1. Open App Store.
2. Click the Updates tab.
3. You'll see macOS updates available for your Mac.
4. Click Update.

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Wait for macOS download and installation. Your Mac will restart when it's done.

Now you have a new OS.
For historic interest, this is how macOS Sierra looked back then when it was still available in the Mac App Store. Now, it can't be found there anymore.

Download macOS installers directly from Apple

For users of past operating systems Apple created a handy a list of macOS installers. They go as far back as to macOS Yosemite. The first 3 of them will open and start the update process automatically.

• macOS High Sierra 10.13
  The 3 following installers will download macOS as a disk image (.dmg) After you unpack it, the macOS updater app will appear in your Applications.

We hope this guide has been of use, and don't forget to clean up your Mac and back it up before you get the classic macOS! Cheers.