Since canonical is shutting down Ubuntu One, what are the possible alternatives?
I currently use Ubuntu One as a backup service for my Documents folder and various other folders I deem important. Of course I have backups on an external hard drive as well, but nevertheless, I find Ubuntu One to be very useful. What I'm especially looking for is a cloud service that does not need a special folder (such as a dropbox or google drive folder); something that is able to integrate into my own file system and syncs just any folder I want to.
I am aware that this question is rather subjective, but I do guess many people who have used Ubuntu One are now in the dark.