"Attempt to start Data synchronization service failed!" error occurred

At the Branch Manager UI, you receive the following warning message:

"Attempt to start Data synchronization service failed!"

Reason:

When a Branch site has a newer version of Arcserve Backup than the corresponding Central Primary Server or the Central Primary Server is not online.

Action:

Verify that the Central Primary Server is online.
Verify that the status of the "CA ARCserve Dashboard Sync Service" is not "Disabled". If so, change the status to "Automatic" on the branch site and then perform a full data synchronization.
Verify that the version of Arcserve Backup for the Central Primary Server is the same or a newer version than the Branch Primary Server.
If problem persists, uninstall and reinstall Global Dashboard from your branch site.