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10.6: Let Time Machine backup File Vault while logged in
Authored by: chucky23 on Apr 30, '10 07:30:23PM

48 hours in, and the "Re-Capacity" measure is working with flying colors on my rig.

Multiple backups, multiple restores, and all works well.

And you can repeat the above steps to change your FV images capacity, both up and down.


While it is hacky, I can't see a situation where it'd cause any real problems. The only exception is if Apple were to change FV methods in 10.7, but that won't be out for a year, and even if it does, you can just toggle FV off/on to restore to Apple factory defaults of FV capacity.


In short, I recommend this method, should you wish to follow the trick but run into the false "Capacity" issue on a FV volume.

As always, I wouldn't count on this as a full backup solution. I use TM as above to backup my logged in FV, but then I backup with CCC twice a month when logged out of my FV account.

That gives me the TM backups when logged into FV, the starfield UI to examine, archive, and restore my FV volume, and also give me a FULL CCC close suitable for instant full restore in the event of things going blooey. (Then you'd have to manually restore your more recent FV logged in TM to overwrite the older FV items.

The only problem I still can 't work around is the insecurity of the encrypted image I make for FV login backups. The disk image key is stored in the System keychain, which is a bit security hole. I'll work for a bit on seeing if there is some workaround this one.

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