Batch file to copy only files that do not exist OR answer no to overwrite

[bmacbmac]

Hi,

I have two directories:  source and destination.  Is there a way I can copy only new files that exist in Source, but not in the destination?  Basically to mirror them up.

OR, is there a way I can have the batch file answer NO when asked to overwrite?  I'm thinking just write a basic copy C:\source C:\destination and answer NO when asked to overwrite each file.   I can use the /y option but that just overwrites anyway.  Looking for a way to skip the overwrite.

Thanks!

B