Maybe, but most storage providers don’t expose a seek/range API for their consumer stuff, so you’re doomed to fetch & upload the whole block every time. For ab

Maybe, but most storage providers don’t expose a seek/range API for their consumer stuff, so you’re doomed to fetch & upload the whole block every time. For about a decade, Dropbox was the only one to offer delta sync, OneDrive added that a few years ago, and they’re the only two IIRC that do delta syncing. The rest basically redownload & reupload.