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10.6.7: Set up encrypted Backup in Time Machine for FileVault
Authored by: langiter on May 29, '11 11:49:50PM

Thankyou, crarko, for patiently going through the whole thing! I’ve now been using this technique for all my Time Machine backups for almost two months, with almost no hiccups.

The one hiccup: once, Time Machine refused to back up when told to. Solution was to copy the encrypted backup’s password into the System keychain, back up, and then remove it again. Has worked perfectly since then.

If anyone wants the whole explanation for inflated FileVault ‘Used’ values, here is the complete example:
E.g. if 500 GB HD, then 1000 GB “Capacity” FileVault sparsebundle. If 200 GB data in HD, with 100 GB in FV sparsebundle, then HD has 300 GB free, and FV sparsebundle has 900 GB free. 300 is less than 900, so “Available” figure is set to 300 GB. “Used” is then erroneously 1000 - 300 = 700 GB.



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10.6.7: Set up encrypted Backup in Time Machine for FileVault
Authored by: langiter on Jun 13, '11 07:14:28AM

The 'hiccup' just happened again. The reason appears to be Time Machine wanted to verify the backup. Again, used Keychain Access to copy password into System Keychain, and then it worked. Once again, removed password from System Keychain afterwards and it's been fine since.



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