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    RAID is not backup.
    – ChanganAuto
    Commented Dec 30, 2021 at 11:19
  • So are you saying it will not save files becoming 0Kb due to ordinary way storage works around losing clusters. I am not otherwise planning to use RAID to backup I back up everything to one of a number of USB sticks once a month anyway but that is only to recover things that I have deleted or edited unintentionally or a computer failure.
    – Andrew Lohmann
    Commented Dec 30, 2021 at 11:29
  • If you already have backups then fine, that's what I was hinting of, nothing else. Now I must complement it with RAID isn't a solution for failing drives or any other condition causing file corruption.
    – ChanganAuto
    Commented Dec 30, 2021 at 11:34
  • I will wait to see what other people say. I used two dimensional parity checking to protect a 256 byte serial EEPROM, that is as big as you could get 30 years ago. If the instrument was turned off during a save this software would recover at least one byte and warn if two bytes were lost. It used 32 bytes. This was what I was hoping for but on a bigger scale. I am not talking about using HDDs that are in a poor state but using HDDs that are good or excellent but of cause will in the normal way of running loose data and replace clusters as a part of SMART.
    – Andrew Lohmann
    Commented Dec 30, 2021 at 11:48