Oh no, you!
No, just one. You set up one device/server as a VPN gateway (often called VPN concentrator), and you will have access to anything the concentrator has access to on your home network.
Either you use your VPN concentrator as your jump box, or you set up routing and firewalls to be able to access them directly.
I have no experience with OMV specifically, but generally making things accessible from outside your house means exposing it ti the internet.
However, what you can do is to only expose an openvpn port, so that to gain access as if you were at home you could connect via o0envpn first.
rsync if it’s a from/to I don’t need very often
More common transfer locations are done via NFS
DO NOT call the police. They will confiscate the server as evidence, and lacking any other suspect, you will be their primary lead. Police aren’t about convictions or justice, they want to consider a case solved.
By law, you are not liable. But because of law enforcement incentives, it will absolutely become your problem.
Pacific Ocean -> Vancouver Ocean
Atlantic Icean -> St. John Ocean
Good move. I have my home network and its home lab the same way I run my work networks and server clusters:
Any system beyond a vanilla install will need some tweaks to fit your use case(s). And these tweaks often end up as a stack of glass boxes over time, unless meticulously planned and purpose built from the beginning.
As long as it’s manageable and secure, don’t let “perfect” be the enemy of “operational”.
Wanting to rebuild from scratch is pretty common. The question is whether you need to and should. You have to weigh cost and work hours up against any benefits to figure out the answer.