How to easily transfer 800 GiB+ of data to nextcloud

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I don’t believe it is possible at present to mount an additional drive to the server as you were attempting.

Instead I believe the easiest way to transfer data from an HDD to Nextcloud would be something like this:

  1. Mount the HDD to a laptop.
  2. SSH into your server from the laptop in step 1.
  3. Use rsync to copy the files from the HDD to the appropriate Nextcloud directory. As an example you might look at the command for copying the blockchain in step 7 of the raspiblitz migration guide. This would of course need to be modified to copy the files from the mounted HDD filepath and target the appropriate Nextcloud directory.