Abstract: A messaging system uses a cloud storage backup system for messages and a temporary storage for messages that are not deliverable to offline devices at the time that the messages are sent by one or more messaging servers. The messages are backed up through a synchronization process that transfers a batch of a plurality of messages rather than a single message or an entire database of messages. A conversation state can be synchronized first before synchronizing messages through the transfer of one or more batches of messages.

Abstract: A messaging system uses a cloud storage backup system for messages and a temporary storage for messages that are not deliverable to offline devices at the time that the messages are sent by one or more messaging servers. The messages are backed up through a synchronization process that transfers a batch of a plurality of messages rather than a single message or an entire database of messages. A conversation state can be synchronized first before synchronizing messages through the transfer of one or more batches of messages.

Abstract: Data items such as files or database records associated with particular applications (such as messaging applications and other applications) can be stored in one or more remote locations, such as a cloud storage system, and synchronized with other devices. The remote storage can be configured such that each application executing on a client device can only view data items stored at the remote location to which the application has permission to access. An access manager on each client device enforces application specific access policies. Storage at the remote location can be secured for each application associated with a user or user account, for example, using isolated containers. The cloud storage of data can be anonymized and anonymous group data can be stored in the cloud storage.

Abstract: A messaging system uses a cloud storage backup system for messages and a temporary storage for messages that are not deliverable to offline devices at the time that the messages are sent by one or more messaging servers. The messages are backed up through a synchronization process that transfers a batch of a plurality of messages rather than a single message or an entire database of messages. A conversation state can be synchronized first before synchronizing messages through the transfer of one or more batches of messages.