Efficiently configuring multiple backup data policies with information specifying data to backup

摘要

A system and method for determining the data that should be backed up by a plurality of backup policies are described. A global file change log that lists which files have been changed may be maintained. The global file change log may be processed to distribute the file change information into policy-specific file change logs. A global block change bitmap may also be maintained. The global block change bitmap may indicate which data blocks of the files have been changed. Performing a respective backup operation for a respective backup policy may include backing up only the data blocks that have changed in the files listed in the respective policy-specific file change log since a previous backup operation for the respective backup policy was performed. The data blocks that have changed may be specified in a respective policy-specific block change bitmap for the respective backup policy.