I was just tidying up my case and noticed that one of my HDDs had a manufacture date of 2009 on it, so it's probably been running in there for a good 7 years at this point. Anything important I already have backed up on the cloud, so if the drive dies I wouldn't lose anything vital, though it would be a pain to replace everything in there. On the one hand, it makes sense to get a replacement drive now and just copy everything over while it works, but equally it could also go another few years without dying, so it would be a waste to replace it now. So, how often do you replace working drives? Or do you just work them all to death before replacing?