Home > Data Protection > PowerProtect Data Manager > PowerProtect Data Manager: VMware Virtual Machine Protection Using Transparent Snapshots > Delta sync operation
After the transparent snapshot creation operation is complete, you can initiate a delta sync operation or an incremental operation (see Figure 13). The process is as follows:
Note: The delta sync operation uses a Fast Copy overwrite approach. In this approach, the previous point-in-time files are first fast copied. The fast-copied files are partly overwritten with the incremental data. Only the delta or changes that are represented by the currently synced snapshot are copied. These changes are copied in the Snapshot Extent Store (SES).
Note: From this point in time, the files on the PowerProtect appliance are crash consistent and can be used for recovery. For a full backup, both full sync and delta sync are performed. However, for an incremental backup, only delta sync is performed. A full sync can back up four VM disks in parallel; a delta sync can back up 10 VM disks in parallel.