I happen to have a small QNAP box as well, on which I keep a small RAID array, but it recently went wrong. HDD1 failed and went red. Never mind, I thought, the show can continue until I put in a replacement. I usually use the drive for directly connected photo editing, although I'm not convinced it is any faster than my LAN attached Synology drives. After the failure the QNAP decided to play it very safe and went into read-only mode, insisting I put a new disk in before normal service could be restored.
Because there was no spare spinning in the cabinet, I had to wait for another one to arrive, which is now installed - and I'm now using RAID 5 on this little box as well. I've decided it is better to run a full rebuild, which is quite lengthy.
Fortunately I use the 3-2-1 backup rule: At least three copies of the data; two of the backups should be stored on different types of media, and at least one backup should be stored offsite or in the cloud.
Phew.
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