Incremental snapshots also offer a differential capability, only available to managed disks. They enable you to get the changes between two incremental snapshots of the same managed disks, down to the block level. You can use this capability to reduce your data footprint when copying snapshots across regions. For example, you can download the first incremental snapshot as a base blob in another region. For the subsequent incremental snapshots, you can copy only the changes since the last snapshot to the base blob. After copying the changes, you can take snapshots on the base blob that represent your point in time backup of the disk in another region. You can restore your disk either from the base blob or from a snapshot on the base blob in another region.
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