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10.7: Use local Time Machine as an instant safety net
I have a bad habit of not checking back on hints I've submitted!
crarko and others express concern about the disk space usage of local backups. Turns out this isn't a huge issue for two reasons: Firstly, hard links are used for local backups, so any file in a backup set that's identical to the current file on disk takes up (virtually) zero additional space. Secondly, Lion industriously and constantly prunes local backups. If you open the Console application and search the system log for Mobile snapshots are stored under That said, one should probably keep in mind that very large files are not Time Machine-friendly, including large disk images or VM images. For the former, one should use a Time Machine-friendly format like a sparse bundle, and for the latter it's worth upgrading to new versions of VM environments that support non-monolithic disk images. |
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