Thanks! glacierxx.
I found that folder. May I ask a litter more?
I found there were many subfolders in that folder, some of which is named by date, some name of thich is like tmpX.tmp (X is a number), and others are like BinHub, TextHub, incoming...
Many of these subfolder has the similar files structure (some .dll, some .dat, some .inf......). Should I backup all the subfolders or only one of them is the latest one that I may backup only?
thanks again!