I've used it to keep track of data stored to data tape as well as the numerous external disk drives I've accumulated over the years. It works well and makes it easy to track down where files are without having to load tapes or external drives.
Yep. It's straight froward and super useful. I handle lots of drives every day in my work. This gives me browsable snapshots of these drives so I can find where something was saved even with the drive offline.