We do not support running SpiderOak ONE directly on an NAS device. Some of our users have reported success with running the Linux version of ONE on their Linux- and BSD-based NAS devices. We applaud experimentation, though of course the standard disclaimer applies: we have not tested the below and are unable to provide support for such setups.
In the meantime, you can still back up an NAS system using ONE. The NAS first needs to be mounted on any computer running ONE. By "mounted", we mean that it is visible in your computer's file manager (Windows Explorer, Mac Finder, etc.). Once it is mounted, look in ONE's Backup tab. You should now see the NAS in ONE. If you do not see it:
If ONE was already running when you mounted the NAS, then it might not appear in the Backup tab immediately. Close and reopen ONE, and the NAS should now appear.
On Mac, mounted external devices do not appear until you first select the "Show Hidden Files" button in the Backup tab. Then, expand the /Volumes to see your external devices.
Once you see the NAS in the Backup tab, you can then select its contents for backup as you would other files or folders.
We suggest that you do not select the entire NAS volume. Instead, drill down one level and manually select what you want at this level. Do this even if you want everything. The reason for this is that on many NASs, whenever any file changes, the mtime of the volume is updated. If ONE is watching the entire volume then this will cause it to deduplicate the entire volume. On an NAS in normal service, the volume's mtime will change much more frequently than ONE can deduplicate it, getting ONE stuck in a never-ending loop. So for best performance, select not the entire volume but the files and folders one level down.