I've loved Ubuntu One for years. This is too sad, I would've wanted to have Ubuntu use it automatically for all kinds of things such as home directory backups etc.

Are there any good open-source self-hosted options that I could run on my little box at home? Preferably something that doesn't require a special setup or deployment on a server.

I could imagine there are file-sync solutions that just need an operable SSH account somewhere and merely automate the use of rsync to do the transfers, watching files and taking care of conflicts.