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I was a bit like that with my old edgerouterX/toughswitch/unifi wifi setup at our old place.
I'm documenting as I go here and making sure it's all bookmarked and passwords properly vaulted etc.
containerising most of it should help a lot as the docker scripts will document a lot of the config.
proxmox allows for scheduled backups of containers/vms so I'll be doing full backups to a local drive and probably online too.
HatBeard
I'm sure that I am preaching to the converted, but I would advise to document all of these things well.
My bete noir with whenever I setup home infrastructure is that it usually works flawlessly for long enough for me to forget how it all works, before promptly breaking, leaving me unable to recall the port numbers for admin websites or whatever.