Time to sort out my data backups accumulated over time and purge the unneeded old ones
I was also thinking replacing them with SSDs but don't see much benefit atm, only cost.
Better if I make a NAS from the old miniITX system laying around (even if it's quite underpowered and missing some parts ) and use 2 of those HDDs in a RAID1... When I will feel myself not too lazy ofc