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Authored by: dvessel on Aug 15, '11 05:20:47PM

It can take up a lot of space but it will not happen immediately. As the files are being modified, the original is backed up once for each snapshot thatís taken. Itís not like a full Time Machine backup where it actively copies your boot drive. It seems to be using fsevents to monitor changes and moves the originals into /.MobileBackups sorted out by the time the snapshot was taken.

This is extremely useful even if you donít run Time Machine backups especially for short-term use.

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