Best practice for duplicating Borg backup repo?

I am currently hosting Nextcloud on Linode using the AIO Docker container. I am very happy with how this works, but the running costs is more than I would like to spend on this. I am running a 4 GB Linode (anything less would cause severe lag in the Web UI), with 2x100GB block storage (one for data and one for the Borg backup)....