Time Machine is designed to back up your selected volumes every hour, writing any changes you've made into a new snapshot that captures only the differences between the previous backup. (Apple software, like Pages and Numbers, and a lot of third-party software create a version every time you save, providing backups within apps much more frequently than hourly.)
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But some readers wonder what happens if they don't keep their Time Machine drives powered up all the time. Apple designed Time Machine to be resilient, so it doesn't skip a beat if one or more of the destination volumes you use for backups isn't always available.
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The ideal situation is that any drive you use is always plugged in and thus backups always happen while it's on. This is particularly useful—maybe critical—if your Mac acts as a networked Time Machine destination for other computers on the network, as they may be backing up at times you're not using your Mac—if a partner is working late or one of your kids is writing their term paper at 2 a.m.
However, as long as macOS lets you unmount the Time Machine drive, it's safe to not have it connected. Use the Finder to select the drive and choose File > Eject 'drive name' (Command-E), and macOS will tell you if it's in use, or it will eject it otherwise. You can also shut down your Mac, and the drive will properly unmount and be absolutely safe to power down or unplug once your Mac shuts down completely.
While your drive (or drives) aren't connected, macOS uses temporary local Time Machine snapshots to store interim versions, so you don't lose changes during that period, either. (These can sometimes bloat out of the control for unknown reasons; here's some advice on how to manage that if you see your startup volume filling unexpectedly.) Race in yo face mac os. Cube boi infinite mac os.
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Then, within an hour of mounting a drive's Time Machine volume associated with any Macs (and selected volumes) that have had changed files, Time Machine on those computers will transfer over the locally cached snapshots and delete them, and then begin regular hourly backups again as long as the drive remains mounted. Offister (adayfs) mac os.
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As noted in many previous columns, you can also have multiple Time Machine destinations plugged in at once or selected as destinations, and then use that to rotate on-site and off-site drives for additional backup security against fire, theft, or accident.
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