Comment 2 for bug 692243

I don't remember exactly now, but I said in the bug report that there wasn't enough free space to perform a full backup, so the disk space must have been low when I got this bug. Anyway, I see several ways of improvement:
1) Tell the user what is happening: this is needed, even if you don't give the choice, show somewhere a reason. If it's because of lack of free space, people might prefer to free some space manually and run the backup again.
2) Check that there's enough free space before trying to do a full backup: if it fails while an incremental backup would have succeeded, there's obviously a problem! (But I'm not sure you know in advance how much space you'll need.) This leads to:
3) Looks like the full backup was added to the older ones, rather than replacing (part of) them: in these conditions, it was a waste of space instead of a gain. If the user is asked before (cf. point 1), then doing a full backup to replace the older ones is a smart behavior (but only in that case).

Thanks for your work anyway, I use DéjàDup in other cases and it's really a nice tool.