[file] SHA-256 or MD5 for file integrity

  1. No, it's less fast but not that slow
  2. For a backup program it's maybe necessary to have something even faster than MD5

All in all, I'd say that MD5 in addition to the file name is absolutely safe. SHA-256 would just be slower and harder to handle because of its size.

You could also use something less secure than MD5 without any problem. If nobody tries to hack your file integrity this is safe, too.

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