Apparently a copy of the raid data should also be made.
It's probably best to use another computer.
Can there also be a local copy from raid to some disk?
There is also a USB Backup plugin, but I think it is the same as rsync to a local disk.
Or maybe I'm wrong.
Only the simplest command would prevent copying the same thing when it is already in the copy and it looks like this
rsync --ignore-existing -raz --progress Source username@remote_host:Destination
In this Rsync tab there is -a for archive mode, -r for recurase into directories, -z for compress, but I don't see --ignore-existing.
Should I add it in the Extra options tab?
Do I have to have the rsync server enabled on the other computer I'm sending to?
There is something like this in OMV and in the archiving computer to install and turn on the server there.
Alternatively, please give me some advice on how to archive data.