Storage Archive Error - 29057

Anyone familiar with this one;

A problem was encountered while trying to process a saveset in the storage queue, but it appears that the problem may be recoverable. The saveset will be requeued and another attempt will be made to process it later.  
 
Details: Operation did not complete successfully because the file contains a virus or potentially unwanted software.  (0x800700e1)

Just started to show up fairly recently.