Changed Block Tracking for Image-Based Backups (new backup format)
Changed Block Tracking is an algorithm that features a decrease of data reading in backup source during incremental image-based backups.
The changed block tracking algorithm is supported by NTFS file systems only
This functionality is not supported for the current backup format
How It Works
Once a first full backup is made, each MFT (Master File Table) block is marked. On subsequent incremental backup runs, the MFT table is read again and blocks are compared. If a block was modified, the changed block tracking algorithm determines which files were modified and locates disk clusters that contain these files' data.
Once all blocks are compared, only modified blocks are sent for reading.
As a result, the changed block tracking algorithm reduces the processed data amount when reading a disk that significantly reduces the backup time.