MarkoB Backup, any suggestions and should i use btrfs or not ?
Most of your questions are souls-agnostic as in purely opinion, and we all have them.
Personally I use Mullvad and Librewolf and Ungoogled but some might find then restrictive plus I have no "threat level goal" or whatever its called since I'm an ordinary user.
Use the search forum upper right for the BTRFS question. There's some good discussions on it. It's been a while since I bare-metal'd Solus. I don't even know if that option is there, vs. EXT4? I see nothing about at Solus main site.
I don't have a VPN.
Welcome, this is a solid, unique distro. Which DE did you like the most?