Patent ID: 8082408

Claim:
A computer-accessible storage medium storing program instructions executable to: create a first snapshot of a volume, wherein the first snapshot represents a first state of the volume at a first point in time, wherein the volume includes a plurality of files; initiate a first backup operation to backup the volume to a first backup image using the first snapshot; in response to detecting that the first backup operation terminated before completion: create a second snapshot of the volume, wherein the second snapshot represents a second state of the volume at a second point in time; identify a first subset of the files of the volume that were backed up to the first backup image by the first backup operation and were not modified between the first point in time and the second point in time; identify a second subset of the files of the volume that were backed up to the first backup image by the first backup operation and were modified between the first point in time and the second point in time; identify a third subset of the files of the volume that were not backed up to the first backup image by the first backup operation; initiate a second backup operation to backup the second subset of the files and the third subset of the files to a second backup image using the second snapshot; and merge the first backup image and the second backup image.