An Ardour session is stored in a single folder on the computer's filesystem. This makes backup very easy—any tool capable of backing up a folder can be used to backup a session. The location of a session can be chosen when it is created—by default it will be in the default session location, which can be altered via Edit > Preferences > Misc > Session Management.

There is one complication: a session may reference media files that are stored outside of the session folder, if Session > Import > Copy to Session is not selected during import. Backing up a session without embedded files will not create a copy of the session containing those files.

The single folder approach also makes sharing a project easy. Simply copy the session folder (onto a storage device, or across a network) and another Ardour user (on any platform) will be able to use it. The limitation regarding embedded files applies to session sharing as well.