I recently had a disk failure on my Synology and was pretty happy with how it was handled. I have a DS213+ with 2 x 4TB drives in a raid 0 configuration. I use the NAS for data and TimeMachine backups. Disk 2 failed. Reassuringly, with raid 0 and one disk failed, the data was still available until I replaced the failed drive. If needed, I could have copied the data to another drive before replacement. Raid 0 is a little more robust than I thought.