backup copy of a workbook
 

In excel 2000 we can make a backup copy using gneral options in saveas
window.
but in present excel 2002 if I follow this there is trouble.
suddenly it refuses to save (control+S) because of some "share violation"
and can save only a temporary file if you will lose changes now and in
future also blah blah. I cannot even copy that error message. somebody may
please educate me on this. Is there any possibnility of having back up. In
the backup winodw I did not enter any password etc. Of course I did not
check "read only (recommended)" item also.

thank you.

venkat