xcopy without replacement

[elimenohpee]

I'm trying to write a .bat file (I just started learning msdos and scripting tonight so bear with me) that will backup/copy any new files placed on my jump drive onto my home computer.  To do this, right now I'm just running a xcopy command from the command line.  However, is there a switch that will tell dos not to copy if the file already exists and hasn't been modified?  I was able to copy all the files, but I thought it might be time consuming if everytime I plug it in it has to copy the ENTIRE jump drive, instead of the new files.

/U seems to have exactly what I need, just opposite

Thanks for any help

[T.C.]

Have a look at the Xcopy /M switch.

Hope this helps.

[elimenohpee]

That didn't seem to work, it still asks me if I'd like to overwrite the file, which I don't.  Right now I'm using this as the script, which gets the job done, it just takes about 2 minutes to sync everything up.

@echo off
xcopy e:\jumpdrive c:\documents /s /m
xcopy c:\documents e:\jumpdrive /s /m

I'd like it to only copy new files, instead of copying 533 files (last run) each time it executes.  The switch /y seems like it should work, but it tells it to overwrite it, which is opposite of what I actually want also.

[elimenohpee]

Figured it out.  If you use the switch /d without a date specified, it will copy only files that have changed at some point.  Works perfectly now.