When restoring a backup on an un-associated node, the file system backup service saves the backup into the var/backups directory with with a name like node-0-backup-X.zip where X is a date. The 0 is because there is no node ID when the backup is imported.

Once restored and listing the available backups in the SolarNode Settings UI, that backup should not appear, because the node ID will now be set to something other than 0 and thus will not correctly download or work for restoration.