Difference between Storage and Persistence?

Hello,

I have already installed Loki + Promtail and can view logs in Grafana. I would now like to make sure logs are stored aswell. I am looking at the loki helm chart here

Im trying to understand the difference between persistence and storage. What exactly is it ? All I want to do is to store my logs long term in S3 buckets.

Also where can I find a working helm chart config to save logs to S3 ?