Optimized data restore from object storage for directly written data

A computer-implemented method of restoring data stored by a backup process in an object store of a cloud network, comprising:

• initiating, from a client, a restore request to a server accessing the object store, by providing a source identifier of one or more data blocks of the requested data and a timestamp for a backup image at a requested point in time (PIT);
• managing, by the server, a queue of blocks in temporary storage to provide blocks for retrieval by the client;
• initially filling the queue with blocks from a full backup and unchanged by any incremental backup to the requested PIT;
• assembling blocks that are changed from the full backup through one or more incremental backups to the requested PIT using a full block synthesis process, wherein the full block synthesis process comprises:
• storing the full backup block image in the object store, creating a set of delta objects reflecting a change of blocks between the initial full backup and each incremental backup to the requested PIT backup, deriving reverse delta objects for each forward delta object, and creating, for each block of the request PIT backup, synthesized full backup blocks by applying a respective reverse delta object to the full backup for the requested PIT backup;
• and
• sending to the client the blocks initially filled in the queue with the assembled blocks to return a full PIT backup image for the requested PIT.

A system for restoring data stored by a backup process, comprising:

• an object store provided in a cloud network storing the data stored by the backup process;
• a client initiating a restore request to a server accessing the object store, by providing a source identifier of one or more data blocks of the requested data and a timestamp for a backup image at a requested point in time (PIT);
• and
• a server co-located with the object store and managing a queue of blocks in temporary storage to provide blocks for retrieval by the client, initially filling the queue with blocks from a full backup and unchanged by any incremental backup to the requested PIT, assembling blocks that are changed from the full backup through one or more incremental backups to the requested PIT using a full block synthesis process, and sending to the client the blocks initially filled in the queue with the assembled blocks to return a full PIT backup image for the requested PIT, wherein the full block synthesis process comprises:
• storing the full backup block image in the object store, creating a set of delta objects reflecting a change of blocks between the initial full backup and each incremental backup to the requested PIT backup, deriving reverse delta objects for each forward delta object, and creating, for each block of the request PIT backup, synthesized full backup blocks by applying a respective reverse delta object to the full backup for the requested PIT backup.