What does "[Update Needed]" mean when attempting to boot from an encrypted backup?
Try this: https://discussions.apple.com/thread/3321886?start=0&amp;tstart=0


To begin, make a backup.
Disable FileVault.
Check for updates again.
Apply update if possible.
Boot into recovery mode by holding Command ⌘->kbd>R at startup.
Run Repair Disk Permissions in Disk Utility.
Enable FileVault again.