Hi. As far as I know, i have not found out how to create history of jobs in Nomad. The enterprise Nomad version features audit logs, but i do not think it does the same thing.
The jobs, logs, allocations, deployments, evaluations are garbage collected by Nomad. Yes, you can configure it to an extent.
I have solved it the following way: I have a endless job running that executed nomad operator api /v1/event/stream with good enough token. The logs are saved to a grafana Loki instance, but a file would do just fine. Then I can parse the events and i know everything that has happened in Nomad. Because jsons are newline separated, simple grep | jq usually gives enough infornation, and sonetimes it is easy with a small python script.