Safe your data to keep automatically backup form USB drives.

USBFlashCopy is a small Windows utility to back up your flash drives and storage cards on the fly. It runs in the background and copies files from inserted media to a safe location on your hard drive.
It's good practice to keep multiple backups of your important data, so try USB Flash Copy - a free utility for Windows PCs that automatically takes backups of your flash drive every time you connect it.
No installation is needed and it's only a 300kb download - get it from www.usbflashcopy.com and run it to set a particular folder on your computer's hard drive for backups (by default, it makes a backup folder in 'My Documents' ).
The first time you connect a USB drive, it will take a complete backup of all contents. Thereafter, it only makes small changes to the backup folder - copying only the files that have been changed or added. If you like, you can alter the settings to keep older versions of files too.

Features :

Free Non-commercial used in silent mode(all process runs in background.)
Not need to install in you system
It copy newer and updated files only
its a very small utility.
Portable
Also supporting profile feature.

System requirements:
USBFlashCopy can be used almost on any PC that has 1 MB of free hard drive space and is running Microsoft Windows 2000/XP/XP 64bit/Vista/Vista 64 bit.