Backup on NFS-Storage

[moe]

Hi there,
i am completly rebuilding my opnsense setup and get a little bit struggling with the backup strategy.
Currently my opnsense is running on proxmox and i backup the full vm with proxmox every day. So currently no config backups needed.

With my new hardware I got Problems to get the full troughput trough the opnsense, so I decided to install opnsense native.

For all my backups (vms, container, ...) I got a NFS-NAS, is there any way to backup the configuration for disaster recovery on this NAS?
I only found ways to do this with nextcloud or google. But thats not my prefered way if i got no internet-access.

Thanks for help!