Retrieving files from a tape is easy; you can either retrieve a full tape or cherry-pick contents to retrieve just a few files.
Retrieve tab. If no tape is mounted, do so first:
When the tape is successfully mounted, it will show a tape name (
LTO-42 in the screenshot), and
0 Bytes selected for retrieval:
Next, to retrieve the tape in full, click on the tape icon and a border appears. Click Next and then select a destination, and continue.
To retrieve a specific file or folder, or a collection of files and folders, click the drive menu (three horizontal lines) and select Select Files...
By default, the full tape's contents are selected. Unselect the root of the tape to deselect everything, and then navigate to what you need to be retrieved.
Canister will show you the size of your selection:
When done, click
Next to select a Destination:
When done, the progress bar turns green:
Click the loupe icon to open the accompanying Transfer Log if needed: