[doctoboggan]

While I haven't exercised this functionality yet my understanding is yes that is possible. You can specify the number of days to store history. (defaults to 30)

[tokenizerrr]

I don't believe that is the case. I think it only stores deleted documents in the .SyncArchive folder, and does not log modifications.

Of course running a cronjob on your raspberry pi to do incremental backups would be a fun way of tackling that problem.