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Catalogs
Each time a tape is mounted, Canister will create a Catalog for it. Canister Catalogs are special folders containing tiny stubs for each file on your tape, and mount as a read-only virtual drive each time Canister opens.

When Canister is open, all Catalogs are available as a virtual drive called LTO Archive. Since a driver installation is required, Canister will prompt you for the install. If not, download the installer directly from our servers. To access catalogs without a virtual drive, Alt-Click the Catalog icon in Canister (top-right).

Catalogs live in Finder so you can utilize all the power of Finder's search. Just hit Command-F and be sure to select "LTO Archive" as the scope. Pro-tip for online/offline workflows: use Smart Folders.

Canister creates a Catalog when mounting a tape and updates it after each Archive. Old Catalogs are moved into a hidden folder named LTO Tape (serial).history, essentially archiving them as well.
To see previous generations of your Catalogs, enable Show Hidden Files in Finder with the shortcut Shift-Command-.

To clean up the Catalog, or remove for instance test entries, you can open the original location where the stubs are saved by Alt/Option-Clicking the Catalog icon in Canister. This will open Finder in ~/Library/Application\ Support/Canister/Catalogs.

Due to the typically large amount of files in a catalog, it's best not to just copy catalogs but to archive them first, without applying compression.
Run this command in Terminal, and it will create an archive on your desktop:
tar -cvzf ~/Desktop/catalogs.tar.gz ~/Library/Application\ Support/Canister/Catalogs
You can copy this archive to a new machine, then unpack it with a free app like Unarchiver.

Currently, it's not possible to use Catalogs to tell Canister which files to retrieve. This feature is on the roadmap, together with EDL support.
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On this page
The LTO Archive
Searching Catalogs
Catalog History
Editing and removing Catalogs
Migrating Catalogs
Retrieving files using Catalogs