I'm playing around with a VPS and have successfully connected a NFS share of my local NAS via OpenVPN. At Home I don't have a connection with a static IP address so once per night the the VPN needs to reconnect, this take about 2 minutes. Is it possible to buffer the NFS mount, so it doesn't produce any read / write errors?
I read about NFS caching, but I think this is only meant for periods way smaller than a Minute. Does any one of you got experience with such a setup?
I'd recommend Wireguard over OpenVPN, it's much faster and just generally more efficient. Notably, it also handles network changes better, and reconnects in seconds rather than minutes. It seems like it would be a much better fit for your use case.
You're quite bold - I like it ;-) in all honesty, is your requirement mounting an NFS share? As indicated by @chris it really is designed for the local network.
How about using something more suited like a WebDAV share/mount?