Thanks, Scillonian and Mayoff. A few more questions: 1) It seems that the first run in v13 produced a lot of .session files -- I assume this represents the substrates for a catalog rebuild for the previously backed-up material (more or less what you are saying if one had deleted the .session files). 2) It seems to create a new ".session" file for each new backup run, right? 3) For Cloud backup then, or even just a normal offsite backup of a standard Disk media set -- are the .session files sufficient in and of themselves such that one would not need to archive the catalog offsite as well? There's nothing else Retrospect would need for a restore, correct? 4) Is there an advantage ('cept for speed) of having the original Catalog file handy? It would be great if this stuff made it's way into the official documentation, but again, perhaps I missed it. Regards, -- madison