I'd like to set up a home NAS to serve my dvd library and handle secure backup of data that is stored on the NAS.
My budget is tight, but I have a raspberry pi 4 available - which means I'll have to settle for USB3 (which I've read tends to be a bit finicky on RPI4s).
My plan is to have the following setup:
2x external USB3 HDD (one 8 TB and one 4 TB)
Drive 1: 8 TB
Drive 2: 4 TB
OMV for general storage handling.
Jellyfin for serving my dvd library.
What I'd like to do is:
1. Use the 8 TB drive as a main drive with some routine to periodically check for silent data corruption.
2. Once every week spin up the 4 TB drive and backup everything inside a folder on the 8 TB drive with a new timestamp and remove deleted files (this would have to be less than 4 TB ofc.)
3. Periodically check the 4 TB drive for silent data corruption.
4. Be able to unplug the 4 TB drive and read it directly on an entirely different system. (e.g. both drives formatted with ext4)
Is this possible with OMW? I've read a bit about snapraid, but the guides I've found say you have to choose a data drive and multiple parity drives. This sounds like the parity drives would only contain parity bytes, requiring rebuilding to read the original data.
I know it's less storage efficient to have a full copy of the data, but I'd like to keep it as simple as possible.