Sony Vegas, but I've only been vidding since December and I haven't acquired good saving/backup/archiving habits yet. This was a welcome reminder. :-) Vegas does auto-save and you can reconnect files if you lose them, so I think it must work pretty much along the same lines.

(Btw, do you cross-post to LJ? I'm tracking your DW, but it's more convenient for me to just friend on LJ, if that's okay.)