SQL 2008 R2, Windows 2008.
Just noticed some SQLVDI errors cropping up in the event viewer. One from yesterday is within a couple minutes of 2 database backup failures. Both backups were at 1.8TB+
SQLVDI: Loc=TriggerAbort. Desc=invoked. ErrorCode=(0). Process=4596. Thread=9820. Server. Instance=SODA. VD=Global\VNBU0-15744-10288-1368203414_SQLVDIMemoryName_0
Error details from activity monitor attached: