You
What is the minimum backup for a home server?
ChatGPT
The data volumes and the compose files, nothing else. Containers are rebuildable; the database and the uploads are not. A nightly restic snapshot to a second machine plus a weekly copy offsite covers the realistic failure modes: disk death, deletion, and theft.
You
How long does this usually take in practice?
ChatGPT
An afternoon to do it properly the first time, then minutes when it recurs. Most of the first afternoon goes into discovering which of the defaults do not match your situation.