How to Create a Personal VPN for Yourself for Free
medium.com
medium.com
We should maybe define what we mean by secure before suggesting these things. Also, we should speak about setups like this more genetically, maybe focus on the software that enables this type of thing (OVPN) and not some big cloud provider in the US giving you a cheap VPS.
FWIW, thanks for the images and clear explanations for setup. I just think in todays world we should dissect these suggestions more deeply.
The other use case —- what this article is about —- is a persistent bridge between private subnets. In general, you can worry about this channel to the same degree that you worry about SSL. To test either, the network sniffer Wireshark is a good start.