A portable app to sync files between computer and usb

Use robocopy which comes as a part of Windows Server 2003 Resource Kit tools (Freely downloadable, at least today, from http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4...
I have a batch file which prompts where to save backup, which I run from PStart with a parameter of %pdrive%, and renames the logfile. Robocopy only copies changed files, so is REALLY quick.

@echo off
%1
cd \backup
set defaultdest=D:\Thumbdrive
set /p dest=Enter destination path [%defaultdest%]
if "%dest%" == "" (
set dest=%defaultdest%
)
echo Backing up %1\ to %dest%...
robocopy %1\ %dest% *.* /LOG+:"backup.log" /X /MIR /NP /R:2 /W:5 /COPY:DAT
set var1=%TIME:~0,1%
set hour=%TIME:~0,2%
if "%var1%" == " " (
set hour=0%TIME:~1,1%
)
ren backup.log "TD%DATE:~6,4%-%DATE:~3,2%-%DATE:~0,2%_%hour%.%TIME:~3,2%.%TIME:~6,2%.log"

Hope this helps. It could be modified to copy the other way if required.

Smotsie