When invoked (either as scheduled or manually initiated), CA ARCserve D2D divides the specified volume into a number of subordinate data blocks that are then backed up. The initial backup is considered the "parent backup" and will be a full backup of the volume to establish the baseline blocks to be monitored. Prior to performing the backup, a VSS snapshot is created and an internal monitoring driver then checks each block to detect any changes. As scheduled, CA ARCserve D2D incrementally backs up only those blocks that have changed since the previous backup. CA ARCserve D2D allows you to schedule the subsequent block-level incremental backups ("child backups") as frequently as every 15 minutes to provide up-to-date backup images.
If you need to restore the volume information, CA ARCserve D2D will then locate the most recent backed up version of each block and rebuild the entire volume using these most current blocks.
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