Rated 5 out of 5 stars

If you're using nexcloud/owncloud, it'll be a bit hard to set up, but you can do it. Refer to this Github Issue:

https://github.com/jobisoft/DAV-4-TbSync/issues/41

Once you get that out of the way, it should work, as it did for me.

This review is for a previous version of the add-on (0.7.22).