Yeah, I don't want to back up to a cloud subscription service, but rather another NAS.
Can rsync be set up with a GUI interface in a docker app, or is the standard way to set it up as a bash script using cron for scheduling?
If both NAS can run crashplan you don't need the cloud subscription service, you can backup NAS to NAS. Granted, a rsync solution would make the files directly accessible on the other NAS without going through crashplan' software.
Now that's interesting. I'll take a look.