If all you want is off-site backup (i.e. not full two-way sync), you can use a cron job to do the backup. For example, the lftp command has a mirror option that is useful. Strato also supports webdav. Another option is to mount it with davfs2. Then do a direct rsync to it. Note that webdav doesn't always handle timestamps well. In my case, I had to do a 2 pass rsync to get around this. A size only (rsync -a --size-only --no-t --no-p) followed by an update rsync (rsync -au --no-t --no-p). Not perfect, but it works. I've also put encfs on top of it so the data is encrypted before it is sent to the webdav server. My setup is something like: BTSync <-> Raspberry Pi -> rsync -> encfs -> davfs2 -> my webdav provider If you want full sync capabilities, as mentioned before, you will need a provider that supports btsync or some other sync mechanism.
