I never keep backups. But they are running RAID1 configuration. One of them have problems but I don't know which one until it fails completely. Both have loud bearings, they sound like old 10k 3,5" drives. And when they spin up from cold start the sound are incredible until they reach full RPM and calibrate. I will make youtube video about this computer. It is one kickass Socket 423 Pentium4 system that is overclocked too.

Speaking about Bitcoin and it's limitations I really want to say take look at wiki here https://en.bitcoin.it/wiki/Weaknesses Here is no real or potential obstacles hat can prevent Bitcoin from becoming omnipresent money of Internet with strong presence in physical world too. Even aging computers can run Bitcoin fine. Any post-2008 made computer can and will run it fine.