Disk monitoring isn't too hard though. For hard drives, run smartctl once an hour, alert when reallocated or pending sectors grows quickly or hits 100. For SSDs, cross your fingers; in my experience with a few thousand, they tend to work great until they disappear from the bus, never to be seen again. Have a data recovery plan that doesn't involve storage of the data onto the same model devices with very similar power on hours --- power on hour correlated firmware errors are real.