While Borgmatic is great, the NixOS module does have easier
configuration for various use cases such as backups in removable
devices. To make this possible in Borgmatic, you have to go through some
loops.
Borgmatic does have easier way of indicating paths. However, in recent
versions of Borg, they have the experimental feature of indicate both
include and exclude through patterns which is close enough.
Also, because of this, we'll be deprecating the custom borgmatic service
at this point. It'll be removed once all of my NixOS-related backup
setups are not using it.
