Asynchronous cross-region block volume replication

A computer system, comprising

• one or more processors;
• a memory in communication with the one or more processors, the memory configured to store computer-executable instructions, wherein executing the computer-executable instructions causes the one or more processors to-at least:
• create a first snapshot of a block volume at a first geographic region and at a first logical time, the block volume comprising a plurality of partitions;
• transmit first snapshot data corresponding to the first snapshot to an object storage system at a second geographic region;
• create a second snapshot of the block volume at the first geographic region and at a second logical time;
• generate a plurality of deltas, each delta of the plurality of deltas corresponding to a partition of the plurality of partitions comprising differences between the first snapshot of the block volume at the first geographic region and the second snapshot of the block volume at the first geographic region;
• transmit a plurality of delta data sets corresponding to the plurality of deltas to the object storage system at the second geographic region;
• generate a plurality of chunk objects from the plurality of delta data sets;
• transmit the plurality of chunk objects to the object storage system at the second geographic region;
• generate a checkpoint at least in part by aggregating object metadata associated with the plurality of deltas and the first snapshot, the checkpoint comprising a manifest of the object metadata, the object metadata comprising chunk pointers corresponding to the plurality of chunk objects in the object storage system at the second geographic region, and wherein aggregating the object metadata comprises updating the manifest to reflect a plurality of differences between the plurality of delta data sets and the first snapshot data;
• receive a restore request to generate a restore volume;
• and
• generate the restore volume from the checkpoint.

A non-transitory computer-readable storage medium, storing computer-executable instructions that, when executed, cause one or more processors of a computer system to perform operations comprising:

• creating, by the computer system, a first snapshot of a block volume at a first geographic region and at a first logical time, the block volume comprising a plurality of partitions;
• transmitting, by the computer system, first snapshot data corresponding to the first snapshot to an object storage system at a second geographic region;
• creating, by the computer system, a second snapshot of the block volume at the first geographic region and at a second logical time;
• generating, by the computer system, a plurality of deltas comprising differences between the first snapshot of the block volume at the first geographic region and the second snapshot of the block volume at the first geographic region, each delta of the plurality of deltas corresponding to a partition of the plurality of partitions;
• transmitting, by the computer system, a plurality of delta data sets corresponding to the plurality of deltas to the object storage system at the second geographic region;
• generating, by the computer system, a plurality of chunk objects from the plurality of delta data sets;
• transmitting, by the computer system, the plurality of chunk objects to the object storage system at the second geographic region;
• generating, by the computer system, a checkpoint at least in part by aggregating object metadata associated with the plurality of deltas and the first snapshot, the checkpoint comprising a manifest of the object metadata, the object metadata comprising chunk pointers corresponding to the plurality of chunk objects in the object storage system at the second geographic region, and wherein aggregating the object metadata comprises updating the manifest to reflect a plurality of differences between the plurality of delta data sets and the first snapshot data;
• receiving, by the computer system, a restore request to generate a restore volume;
• and
• generating, by the computer system, the restore volume from the checkpoint.