How do I make the VPS as a gateway device? I see that I can do a static route, but IPv6 gateway is something im unable to understand

Not sure how’s that even possible, HE usually probes your IPv4 address before assigning a GUA

Tunnelbroker doesn’t work behind CGNAT

That’s what “1” in the “3-2-1” backup strategy stands for, a true offsite backup (preferably continent where you do not reside) For “2” I would still deploy a local offsite at someone’s house for quick disaster recovery.

Downloading your 10TB data from B2 (or even requesting a tarball HDD from them) is costlier than recovering from an offsite backup facility within an hour’s reach.