Verify data integrity of a crypt remote

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#1

I have a crypt remote on a USB drive. I'd like to verify the integrity of the data.

Note that I do not have copies of the flies. E.g. consider files inside backup-dir. if I understand correctly, I can still verify the integrtiy by decrypting all the data.

What would be the best way of doing so?

I can think of a few options:

  • rclone check --download remote: remote:
  • rclone cryptcheck remote: remote:
  • rclone copy remote: /dev/null
    • /dev/null probably does not work like this, maybe I need a dummy fs
  • rclone mount remote: + a script that read through all data
#2

Probably the easiest way of just downloading all the files is

rclone md5sum remote:

You get an md5sum you can feed back into rclone md5sum -C for bit rot detection also, though the crypt decode will almost certainly fail if you have bitrot.

  -C, --checkfile string     Validate hashes against a given SUM file instead of
#3

I think "copy to dummy fs" would be faster, since it doesn't need to compute any checksum. But probably md5 is fast enough.

Thanks!

#4

If you want more speed you can run rclone hashsum crc32 remote: Even my 4 year old laptop can MD5SUM at 500 MiB/s though so you probably won't notice the difference.

#5

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