Does UX really matter?
I’d rather decouple DNS and domain.
Feels like (no proof, just gut feeling) services like Cloudflare have better security and integration than the respective registrars.

I migrated from IONOS and Namecheap to INWX because it does support both domains I use.
And their prices were reasonable.

Migration was quick and neat. Had to issues doing it.

Time for old school IP indexes.

Usually DRM detects the obvious stuff/access like OBS/Nvidia Shadow Play and either kills the recording or you have a black window.

Why so hostile sounding against debian?
What does fedora better?

And that’s why you have either a backup for your DNS or know whats auto-updated ;)

As you mention opnsense:
What do you mean with fw rules to only use pihole dns?
This sounds partly like a DHCP config and partly like a deny (hardcoded) DNS requests and to please use what DHCP supplied (looking at you google/amazon)

I’m on a shoestring budget at the moment, so I won’t really be able to implement a 3-2-1 strategy just yet

Having any sort of functional (best case tested) backup is more than a majority has ever achieved on a computer.

Personally I am using Veeam with a (free) NFR license.
Though the community edition is plenty for most situations.

As for what I backup: It depends.
My main file storage is backed on a volume basis
My gaming/pc is also volume based but I have another job that backs my game ROMs
My linux server is backed fully as to not loose anything on it
My LDAP server as well as my financial VM is fully bavked up because it’s so small.