If you back up multiple disks attached to your Mac, such as external hard disks or additional internal hard disks, and you want to restore data from one of these disks but it is not connected to your Mac (or the disk is no longer working), follow these steps:
1) Click the Time Machine icon in the Dock, or choose Enter Time Machine from the Time Machine menu extra.
2) Click the computer name found at the top of the devices group in your Finder sidebar, or press Shift-Command-C.
3) Click on the name of the unavailable or absent volume.
4) Select the data you want to restore.
5) Click "Restore".
6) When "The enclosing folders for some items no longer exist in their original locations..." dialog appears, click the "Choose Location..." button.
7) Navigate to the location that you would like to restore your data to, then click "Choose".
