iPad 3 back up doesn’t work: solved

Since getting my iPad 3 at launch, it has never backed itself up. It always displayed “Unknown” and the “Back Up” option was missing from the right-click menu. Today I finally found a forum post with the solution. I’m reposting it here in hopes that more people find it:

o At first, close iTunes.
o Then, open Terminal and type the following commands in:

defaults write com.apple.iTunes DeviceBackupsDisabled -bool false

defaults write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool false

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