I solved my problem. We have an EMC DataDomain DD860.
One of the logs bptm or bpbrm on the master server showed errors for the dd860.
13:48:21.942 [22227] <16> 4037533:bptm:22227:fs-lin-bu01: [56D3:BE4A40] ddp_synthesize_file() failed, dst_offset[3...