A few weeks ago I rebooted by main server and because it was taking a long time to come back I went to the cabinet to see what the problem was. It was stuck correcting what seemed like a zillion disc errors and "correcting" the faults. I quote correcting because in reality this means "deleting any file we think is damaged". Luckily this was my media drive, which has continued to have problems (a new one is ready to replace it). Unluckily I've lost a lot of treasured TV and radio programs and a fair amount of music. The music is recoverable (but time consuming - finding what's gone and then re-ripping), but the TV and radio is lost. Some I can get back via torrents, but some I probably can't, mainly because I can't actually remember all I had. It was all too big to backup properly and that large RAID array I've been promising myself forever is still to expensive. My recommendation - buy a large USB external drive and just backup everything you have. Checking 50Gb of music is not something I'm looking forward to.