I'm about to install the BeeStation (1 x 4 TB, not mirrored). I also have a Synology DS218 (2 x 2 TB, mirrored). I connect the two via Windows Explorer (<drag/drop>). I'm sure there are other methods (Hyper Backup or similar), I still have to find out. Whether it makes sense to make a backup from the BeeStation to a Synology NAS or vice versa is up to you to decide.