We're currently backing up quite a lot of data from different servers to a tape library using Amanda Backup and it works just fine.
Now I need a one-off backup of a specific set of files (in a location that's not otherwise backed up) to tape for long-time storage.
Obviously I could create a new Amanda configuration and just run that once, but that has several drawbacks, as restoring requires that configuration to be present or restored from the tape via a manual process (that's acceptable for the general backup but I don't think that's a good idea for a one-off).
What would be the best format for storing a backup on a tape, considering ease-of-restoring and (more importantly) not depending on external configuration data for the restoring process.