I've done a backup today as I have a hundred times on my 2008 R2 machine and for some reason it now will only do an incremental backup of my largest drive (160gb). In performance settings it's set to normal but I've also tried changing it to custom with all drives set to full. I've swapped out to a 2nd external backup drive. I've swapped between vss settings. I've also done a chkdsk on the drive itself.
I'm not sure what else to try other than deleting the old backup and starting fresh?
Please somebody help me!!