Restore your Aperture library
If you experience equipment failure or other unexpected events, such as fire or weather-related damage to your computer, you can easily restore your Aperture library from a vault stored on a backup disk. You can also use the backup disk to transfer your library to another computer that has Aperture installed.
Restore the entire library from an external backup disk
Connect the hard disk drive that contains the most up-to-date vault to your computer, and open Aperture.
Choose File > Vault > Restore Library.
The Restore Library dialog appears.
Choose the vault you want to use to restore your library from the Source Vault pop-up menu.
If the vault doesn’t appear in the Source Vault pop-up menu, choose Select Source Vault from the Source Vault pop-up menu, navigate to the vault’s location in the Select Source Vault dialog, and click Select.
Click Restore, and then click Restore again.