Patent ID: 7310654

Claim:
A method for backing up data in a computer system from at least one primary data source to a secondary data source, the method comprising: performing a full image backup in disk order on a plurality of data blocks stored by the at least one primary data source; initiating an incremental backup at a predetermined interval, the incremental backup including file system metadata; comparing a modification time of each file/folder at the predetermined interval to a defined time, the file system metadata including each modification time, wherein if the modification time is earlier than the defined time, then excluding data blocks of that file/folder from the incremental backup; and determining whether a system clock has been changed, wherein if the system clock has been changed, then returning to performing the full image backup on the plurality of data blocks, and wherein if the system clock has not been changed, then performing one of: initiating the incremental backup at the predetermined interval; and comparing the modification time of each file/folder at the predetermined interval to the defined time.