Second Copy? is the perfect backup product designed for all versions of Windows, including 9x/Me/NT4/2000/XP/2003/Vista, you have been looking for. It makes a backup of your data files to another directory, disk or computer across the network. It then monitors the source files and keeps the backup updated with new or changed files. It runs in the background with no user interaction. So, once it is set up you always have a backup of your data somewhere else.

Highlights
Windows Vista compatible Windows Vista/XP style user interface
Up to 256-bit AES encryption Two-way Synchronization
FTP support Automatic detection/deletion during synchronization
Enhanced compression Automatic scheduled copies
E-mail notification Multi-threaded background processing
Run as a service Universal Naming Convention (UNC) support
Preview profile activity before running Password protect profiles
Run profile when files change Archival of up to 25 old versions
Disk spanning Run profiles at Windows shutdown