Time machine buddy high sierra
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You may find it doesn’t back up files of several GB in size.
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They are also counted in the free space declared in Disk Utility, and third party tools vary in their treatment.Īlthough I cannot find any official documentation to confirm this, Apple engineers have warned that there are also limits to the size of files included in local snapshots, which could be as low as 20 MB. This can be confusing, as the free space reported in that dialog will then be less than that shown in the Finder or Get Info.
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The best way to tell how much space they occupy is to use the Storage tab in the About This Mac dialog, where they will be shown as Backups in the breakdown of space used. when less than 10% remains free, snapshots are removed quickly in an effort to free space when only one snapshot is left, Time Machine may stop making new snapshots until free space improves it then replaces the remaining snapshot with a new one, until there is more than 10% free again.Īpple considers these snapshot backups to be akin to temporary files, so they are not included in the used space reported by the Finder (and in its Get Info dialog).when free space falls below 20%, snapshots are removed until 20% is free, then kept normally again snapshots are made daily.when 20% or more of your startup drive is free, snapshots are made daily, and retained.The way it assesses that is fairly complex: Time Machine is sensitive to the amount of storage space available: these snapshots will only be made if there is sufficient free space. By default, they are also made infrequently: whereas normal backups occur every hour or so, ‘local snapshots’ are made once a day from when you last started your Mac up, and a weekly snapshot is also made. If your internal drive gets corrupted or damaged, chances are the local backups have gone too. If you have a Mac laptop (MacBook Pro, MacBook Air, or MacBook), you will be aware of its ability to make ‘local snapshots’ or local backups, using Time Machine, when you are working away from your normal Time Machine backup drive(s).īecause these backups are made to your laptop’s internal drive, they are not as useful as regular Time Machine backups.