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Nice. V2D is a nice use case every ev should provide
I can’t help much regarding the service denial issue.
However Port 22 should never be open to the outside world. Limiting to key authentication is a really good first step.
To avoid automated scans you should also change the port to a higher number, maybe something above 10,000.
This both saves traffic and CPU. And if a security bug in sshd exists this helps, too.
Just my 2 cents:
Proxmox. Flexibility for both new services via VM/LXC and backups (just install proxmox backup server alongside and you get incremental backups with nice retention settings, file-restore capabilities as well as backup consistency checks)
If it’s in a VM/container you don’t need to worry about backups, see 1.
In this case isn’t it sufficient to be able to access the data via Windows network?