01-15-2021, 03:09 PM
With Synology, you can actually create a RAID1 across 3 or more drives. This would mirror data on all HDD. If you remove this third drive system will still work, but you could not just plug and play it on a computer. You would need to use recovery software to do so. Alternatively, you can create two separate RAIDs / Volumes (or more, one for each drive if need to). Then automate backup to this third drive or to separate RAID. But again it would not be as plug and play.Asustor off Archive option allowing you to remove drive easier, but still need to use their NAS to see the data.Only Qnap and Asustor allow M.2 cache to be used as storage instead. With Synology this only works as a cache. When you upload or read data it first uses this faster media to improve performance.I hope this helps.