I’m reinstalling OS on my RPi4 (on SSD USB3-SATA cable), I thought about DietPi, I guess mainly because all automation scripts etc. (before I used Debian, but I didn’t use it too much anyway, just Wireguard server)
at the end I don’t want to run complicated stuff there. Wireguard, fail2ban, and some dockers (and Portainer probably): PiHole (doesn’t have to be in docker), PostgreSQL (for my projects), and some apps - my projects, Potrainer.
I thought that BTRFS snapshots could make it easier to do full or incremental backups to my Synology NAS. with Ext4 if I want to do consistent full system backup, I should stop all services for some time, right?
The easiest would be just to do full system backup i think (bare metal), and if something fails, I can just restore full system/partition (maybe on a new drive).
Any thoughts? 
which system? and if DietPi at all ?