Patent ID: 9367401
Filing Date: 2016-06-14
CPC Classification: G06F

Claim Text:
1. A method for utilizing an incremental backup in a decremental backup system, the method comprising: creating a base backup that includes all original allocated blocks in a source storage at a first point in time, the base backup alone representing the source storage at the first point in time; prior to a third time period, creating an incremental backup that includes allocated blocks in the source storage that were newly allocated, and allocated blocks in the source storage that were previously-allocated but changed, between the first point in time and a second point in time, the second point in time being subsequent in time to the first point in time, the incremental backup requiring combination with the base backup to represent the source storage at the second point in time, while the base backup alone represents the source storage at the first point in time; identifying the previously-allocated but changed blocks in the incremental backup; and during the third time period, creating a decremental backup and ingesting the incremental backup into the base backup by: