05-03-2018 13:00 via macworld.com

How Time Machine manages backup archives

If you use Time Machine for a full backup with deep archives from macOS, you can manually delete any of the hourly, daily, and weekly snapshots that the app makes and retains. If you launch the Time Machine app, navigate to a Finder window and then a date, you can then right-click and select Delete Backup.Generally, you should let Time Machine take care of this. It automatically deletes older snapshots over time, which in turn removes only files that were changed at intermediate points (between
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