All config with docker is the same, so basically every service is kind of maintained and especially backuped the same.

Plus, config is just files. If the server is dead, copy volumes and compose files to new machines, two commands, all services up again. No difference in how to deploy some services.

Yep, used ECC server RAM DDR3 or DDR4 is basically thrown out. Unfortunately most consumer mainboards do not support ECC.