Heya sorry for the delay. :)

Sooo I run my PaperlessNGX service on my home server, on which the storage drives are in a mirror configuration. But RAID is not a backup! So they're periodically uploaded to an offsite / cloud service I pay for called iDrive.

When you specify the storage location though, I'm sure you could use something like Borg Backup or any other solution, if you wanted. :)