Automatic Backup Solution

[Seabass]

I have a Nextcloud server I want to backup, and the drives it would backup to I plug in through USB.
We also want to encrypt the drives and we do that with Veracrypt, because the others know how to use it and it works on windows, as well.

I know how to do backups manually, but does anyone have any suggestions that would let me (as an example) plug it in and automatically backup or backup overnight without me needing to interact?

A different system works for a suggestion, as this is just what we currently have.

TLDR: Any suggestions for encrypted backups of data on a Linux server that would be accessible to windows users, when backups are connected through USB?
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