Hi,
reading here and there I'm getting scared and scared about bit rot or similar problems (firmware error? ssd nand ruined?): the disks seems to work fine, but data might be corrupted and so (my) easily backup strategy - that includes two rsynced copies in different places and time, one on ssd and another on hdd - cannot be enough. Please note that all my personal data are on ext4 filesystems and they are less than 1 TB (ok, it's not a datahoarding size bu this is a sub where theme-related experts are). Maybe the probability is low, and the probability that a critical file is impacted is lowest, but you know Murphy? I do.
Now, the gold solution should be to replace all of my physical servers with others that support ECC ram; then I'll have to buy at least 3 CMR-disks for building a ZFS raid or a btrfs similar one. Actually this solution is not sustainable because of time, space and cost: so I have to accept the risk to a second best solution... but which? I also would like to avoid the use of other (just optical) media type.
For example, using a backup tool - restic/kopia or proxmox backup server - might riduce the risk? I say so because of an incremental approach might allow me to restore data at selected point in the past. Of course, I have no way to find that point in the past and, moreover, i will lost all data produced after the time point. Maybe I could apply this strategy just to a subset of very critical and immutable data (official documents)? Or, for these documents, I could just use rsync with the checksum option?
As usual, thanks for any suggestion!
Man... thanks! You are a really Master! It is not clear to me the further steps after the snapraid activities but I have to read it with more attention, I think.