I had the same problem with a Latitude E6510, I downloaded the updated DBRM  from their support site and was able to create the install image recovery disks (took two DVDs)
On a Windows 7 pro (x64) systems (both a Latitude E6410 and Optiplex 780), I am trying to create DVDs of the Dell original factory image using the Dell Backup and Recovery Manager supplied on these brand new systems.   Each time I attempt to write the image to DVD, it completes the first disk then prompts for the second disk to complete the write.  When I insert the second disk DBRM attempts to continue, but displays an warning stating the drive is in use by another application.  With just an OK button.  I press the OK, DBRM seems to stall waiting of the application to release the drive and the second disk never gets written (I waited for hours).  I eventually have use Task Manager to close the DBRM application. I can't figure out what other application is using the drive and I can't complete the disk creation. Any suggestions/solutions for this situation? Regards,  ORFOTech(aka Ron) 
DBRM Error: drive in use by another application.