I just purchased and installed true image on my system. I have had no luck at doing any sort of backup operation with it yet. I have an external USB drive that I am trying to store the backup file on, but it wont let me. I get the error "Operations with partition "C:" was terminated. Details: Unable to create volume snapshot (0x70021)." And then it ends the operation. I have tried everything I could think of through the software. I am trying to backup my local c drive onto my external USB drive. I even tried creating the "secure area" on the USB and putting it there but still get the same error. I hate to ask for help but if I can't get it to work it isn't much use to me. Thanks in advance.