If your VM image is being backed up that could be a problem. I keep my VM images on an external drive mainly for overall i/o performance reasons. They're not backed up but then all the data I care about is still on my main drive and safe. If you can tolerate the risk, you could try excluding the VM image directory from time machine and see if that makes a difference.
If your VM image is being backed up that could be a problem. I keep my VM images on an external drive mainly for overall i/o performance reasons. They're not backed up but then all the data I care about is still on my main drive and safe. If you can tolerate the risk, you could try excluding the VM image directory from time machine and see if that makes a difference.