Okay yeah, then you’re absolutely right.

Syncthing. Once you set it up, there is almost no going back. It doesn’t pass through servers though so your backup machine also needs to be on. https://en.wikipedia.org/wiki/Syncthing

Thank you, this is exactly what I was looking for. I’ve found essentially less than 1ms of latency between my mini router and my landlord’s router and I’m very happy with that.

Ping statistics for ________________:
    Packets: Sent = 100, Received = 100, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 5ms, Average = 1ms

So if I understand this, there is barely any latency being introduced here.

I’ve tried several different approaches but the ISP locks the root account on the router but will change it to whatever you want if you call as the account holder.

This network is more private and secure and I don’t have to deal with my landlord. They probably wouldn’t be against it but they’re technologically illiterate and this is a better solution in my opinion.

Sounds good, I’ll go ahead and just do this. Connect to landlord’s router -> ping test -> connect to my router -> ping test. Thanks for the comment!