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There's lots of very good approaches in the comments.
But I'd like to play the devil's advocate: how many of you have actually recovered from a disaster that way? Ideally as a test, of course.
A backup system that has never done a restore operations must be assumed to be broken. similar logic should be applied to disaster recovery.
And no: I use Ansible/Docker combined approach that I'm reasonably sure could quite easily recover most stuff, but I've not yet fully rebuilt from just that yet.
I have (more than I’d like to admit) recovered entirely from backups.
I run proxmox, everything else in a VM. All VMs get backed up to three different places once a week, backups are tested monthly on a rando proxmox box to make sure they still work. I do like the backup system built into it, serves my needs well.
Proxmox could die and it wouldn’t make much of a difference. I reinstall proxmox, restore the VMs and I’m good to go again.
I restored from a backup when I swapped to a bigger SSD. Worked perfectly first try. I use rsnapshot for backups.
I'm not sure what Ansible does that a simple Docker Compose doesn't yet but I will look into it more!
My real backup test run will be soon I think - for now I'm moving from windows to docker, but eventually I want to get an older laptop, put linux on it and just move everything to the docker on it instead and pretend it's a server. The less "critical" stuff I have on my main PC, the less I'm going to cry when I inevitably have to reinstall the OS or replace the drives.
I just use Ansible to prepare the OS, set up a dedicated user, install/setup Rootless Docker and then Sync all the docker compose files from the same repo to the appropriate server and launch/update as necessary. I also use it to centrally administer any cron jobs like for backup.
Basically if I didn't forget anything (which is always possible) I should be able to pick a brand new RPi with an SSD and replace one of mine with a single command.
It also allows me to keep my entire setup "documented" and configured in a single git repository.
While rsync is great, I recovered partially from an outtage... Containers with databases need special care: dumping there database...
Lesson learned !