Patent ID: 8229896

Claim:
A method comprising: processing bitmap information, wherein the bitmap information comprises at least two bitmaps, the at least two bitmaps comprise a first bitmap and a second bitmap, the first bitmap corresponds to a second recovery point, the first bitmap represents a plurality of blocks changed since a first recovery point, the second bitmap corresponds to a third recovery point, the second bitmap represents a plurality of blocks changed since the second recovery point, the first recovery point is associated with a full backup image, and the full backup image is a backup image of a volume; and in response to a request to restore the full backup image, restoring a portion of the full backup image, wherein the portion of the full backup image is an amount of backup data less than an amount of backup data in the full backup image, the at least two bitmaps information identify one or more blocks of the volume, the one or more blocks have changed since the first recovery point, and the restoring restores only the one or more blocks from the full backup image.