Rclone is great. I wrote an integration to use it with git-annex (https://github.com/DanielDent/git-annex-remote-rclone).

Some of the supported providers (e.g. Amazon Cloud Drive) have a reputation for days-long service outages. Some users of Amazon Cloud Drive have even reported files going missing on occasion.

But the great thing with git-annex is you can have your data on multiple clouds (in addition to being on your own equipment), so partial or complete loss of a cloud provider does not need to result in availability or durability issues.