Second Copy is the perfect backup product designed for Windows 9x/Me/NT4/2000/XP/2003 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.
