The use case is this: I have two USB hard drives. Suppose one lives off-site, and another I keep at my desk. It's likely that one disk will get daily backups, the other weekly or monthly.
If I alternate which hard drive I'm backing up to, is DejaDup smart enough to make them both proper incremental backups? That is to say, if I create ~/foo.txt, then backup to hard drive #1, and then backup to hard drive #2, will backup #2 have the file, or will DejaDup decide it already backed up that file and doesn't need to again?
In other words, is it safe to change the backup destination in DejaDup as a means of backing up to multiple places?