Create a valid recovery point on the primary DPM server and rerun the synchronization job. To create a valid recovery point ...

Create a valid recovery point on the primary DPM server and rerun the synchronization job.
To create a valid recovery point on the primary DPM server:
For SQL data, Exchange data or Windows SharePoint Services data, in the Protection task area, click  'Create recovery point', and select 'Express full backup on disk'.
2. For other types of data, in the Protection task area, click  'Create recovery point', and select 'Create a recovery point after synchronizing.