One key feature I'm searching for is the ability to use S3 object storage as backend. Services like backblaze and other offer this kind of storage much cheaper, but not all libraries seem to support it.
Obviously not as cheap, but another option that's available with S3 support is to deploy Garage (or whichever self-hosted S3 implementation you prefer) - Garage has the advantage of natively supporting replication across georedundant zones out of the box.
One key feature I'm searching for is the ability to use S3 object storage as backend. Services like backblaze and other offer this kind of storage much cheaper, but not all libraries seem to support it.