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I don't trust Chat GPT as it has consistently given me bad data. This is kind of a good example. It is answering the absence of information with information that isn't related to the question. I'm again left deriving from what it doesn't say. If I'm reading this correctly, it can use S3 to do backups, but not to provide an s3 compatible service. I'd like some human confirmation of that. Some document of what services it does provide.

The closest docs I can find are at https://longhorn.io/docs/1.5.0/what-is-longhorn/

Longhorn supports volume backup to s3 target and the document to setup the target is here https://longhorn.io/docs/1.5.0/snapshots-and-backups/backup-and-restore/set-backup-target/#set-up-aws-s3-backupstore

https://s3gw.io/ is a good point