I made a backup using XBC v2.9.0.306. using an origional game and kreon 1.0 drive. But when I checked the game using agbX360 1.01 it failed game crc check verification. I tried twice but got the same error both times.

I then used Schtrom360xtract v4.0 to backup the same game and it passed agbX360 verifivation first go. "All CRCs match Verification was successful!"

Just wanted to know why XBC failed to backup correctly where the older Schtrom was successful. Are there known problems with XBC. Should I just stick to Schtrom since it seems to be doing a better job than XBC.

I don't know, I could never get XBC to run at all. Kept giving me some weird drive error and then ended up locking my whole system as I couldn't end the task. Never bothered trying to figure out why XBC wasn't working because I started using Schtrom, works first time every time and every backup is perfect.