I would be very surprised if such a fork would diverge from Linux. I would guess that this would be little more than a branch with (most likely) support for Russian hardware. Just my hunch.
A legitimate hard fork doesn’t seem particularly smart to me, but what do I know…
Remote backup server would be my suggestion.
Configure it with a VPN to talk to your home network and set it up at a trusted friend’s or family’s place.
I do this with a raspberry pi and an external HDD that takes daily/weekly/monthly snapshots, with daily rsync. Works nicely for me.