one of the benefits of things like docker is creating a very lightweight configuration, and keeping it separate from your data.
ive setup things so i only need to rsync my data and configs. everything else can be rebuilt. i would classify this as 'disaster recovery'.
some people reeeeally want that old school, bare-metal restore. which i have to admit, i stopped attempting years ago. i dont need the 'high availability' of entire system imaging for my personal shit.