Hey, what I usually do is, I copy the important data to another usb hard disk which I have. Just today I moved one file from my PC to the hard disk. I plugged the hard disk to another pc and bang, the file wasnt there. I checked my source PC and the file wasnt there neither. Now what I think is that windows isnt reliable in copying the data and there are chances of loosing it even if I backup to another disk, like what happened in the above case. What guys do you use to backup data reliably?