Abstract: An improved scalable object storage system includes methods and systems allowing multiple clusters to work together. In one embodiment, there is a multi-cluster synchronization system between two or more clusters. Each cluster has a cluster-internal network, with object storage services and container services. The container services track and replicate metadata associated with the object storage service. An intercluster network connects the two clusters and performs a one-way synchronization of the objects and metadata associated with a particular container. This can be done either through the direct association of the container and object storage services, such as through a trust and federation relationship, or it can be opaque, so that the cross-cluster replication treats the remote repository as a black box and uses the external API to call and manipulate the files.