I'm running TI 11 build 8101 and the latest snap API build 359 per the following article: Acronis True Image Errors Out With "Unable to create volume snapshot" It started happening after I tried to use a file exclusion during a full backup. It doesn't happen if I don't use an exclusion. I found that article and upgraded everything and tried again, but I get the same error. I was using the following wildcard for the exclusion: c:\folder\*.* Any suggestions? Am I missing something obvious? I'm attaching an image of the error. Thanks in advance for any suggestions.