How Infinite Incremental Backups Work
If left alone, the incremental snapshots (backups) would continue, as often as 96 times each day (every 15 minutes). These periodic snapshots will accumulate a large chain of backed up blocks to be monitored each time a new backup is performed, and require added space to store these ever-growing backup images. To minimize this potential problem, CA ARCserve D2D allows you to set a limit for the number of incremental child backups to be stored. This can be done by configuring the Recovery Points option from the Protection Settings tab on the Backup Settings dialog.
When the specified limit is exceeded, CA ARCserve D2D will merge the earliest (oldest) incremental child backup into the parent backup to create a new baseline image consisting of the 'parent plus oldest child' blocks (unchanged blocks will remain the same). This cycle of merging the oldest child backup into the parent backup will repeat for each subsequent backup, allowing you to perform Infinite Incremental (I2) snapshot backups, while maintaining the same number of stored (and monitored) backup images.