So I've setup my backup solution which is mostly consisting of a borg backup setup.

There are 4 repositories:
system-config: Contains data from /etc, /var and alike
system-data: Contains a list of all installed official and AUR packages, a list of all installed python packages and a backup from LVM + LUKS headers as well as a 100% direct DD from the /boot partition.
user-config: Contains all configuration from ~/.config and ~/.local
user-data: Contains all real user-data like documents, movies, songs, savegames, code and alike.

In general I have to admit my home directory is pretty symlinked. Files/Folders are either linked to /data/private/$username/$folder or to /data/protected/$folder.

Dotfiles are stored in ~/dotfiles which is a symlink to /data/private/$username/dotfiles. Those dotfiles are then linked to ~/.config/$program and alike.

Program data (like mails, hedgewars gamedata etc) is stored inside /data/private/$username/appdata which subdirectories are being symlinked from ~/.$program (like .mozilla, .thunderbird and alike).

This setup took quite some time but ultimatively it forces good behaviors and splits the data into 4 maintainable repositories.
Dotfiles/Appdata that is not specially symlinked gets lost, thus forcing me to keep my ~ clean and updated.

When I create backups using borg I create them with this scheme:
For user-* backups (user-config and user-data): user-(config|data)::$username@$date_$time:
And for system-* backups (system-config and system-data): system-(config|data)::$hostname@$date:_$time:

I will now connect this system to a cloud backup solution. The good thing with borg is that its already encrypted by default, so syncing to the cloud will not be of much concern to me.

That's it for now folks!