DS-Client Help : Working with backups : Backup considerations : Block-level resume
 
Block-level resume
Backups that use the DS-Client buffer can benefit from the block-level resume feature, which allows a backup to continue from the last successful file block backed up if the DS-System has received at least 100 MB of compressed data.
The benefit increases with the size of the file being backed up. If the backup process is interrupted, DS-Client attempts to reconnect a specified number of times to resume the backup. Without the block-level resume feature, a backup of a large file that is interrupted restarts from the beginning of the file.
The following backups support the block-level resume feature:
File system (Windows, Linux, Mac)
Permissions only (Windows, Linux, Mac)
Email (Windows)
IBM DB2 (Linux)
Microsoft Exchange Server (Windows)
Microsoft SQL Server (Windows)
Oracle Database (Windows, Linux)
Oracle MySQL (Windows, Linux, Mac)
PostgreSQL database (Linux, Mac)