What is a best practice to back up a Mac laptop?
What is a best practice to back up a Mac laptop? If I choose to back up to an external drive, do I need to have that connected to the laptop all the time?
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You do not need to be connected at all times— I connect my TM once a week.
TM local Snapshots are kept on board for 24 hours—
About Time Machine local snapshots - Apple Support
3-2-1 Backup Strategy: three copies of your data, two different methods, and one offsite.
Boot clone https://discussions.apple.com/docs/DOC-10081
How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250
Use DiskUtility Restore feature https://support.apple.com/guide/disk-utility/restore-a-disk-dskutl14062/mac