Time Machine says “Link of previous volume failed” after enabling FileVault

Apple – Support – Discussions – Time Machine says.  Interesting.  Pondini has the solution below called “Full Reset” of Time Machine.”

1. In Time Machine Preferences, click the Options button.  Note anything in the exclusions box, and the settings of other option(s) on that panel.  Click Cancel, then turn Time Machine OFF, and quitSystem Preferences.

2. Eject, disconnect, and power-off the drive for a few moments, then reconnect it.

3. Delete the file /Library/Preferences/com.apple.TimeMachine.plist (in your top-level Library folder,     not your home folder).  This will not delete anything in your backups.  If you have a problem finding the file, see item #A7.

4. Go back to Time Machine Preferences, re-select the drive, re-enter any exclusions and other options.

5. A 120-second countdown to a backup should appear.  If you close the window, it should begin immediately.”