automatic backuping/restoring login-password on a local computer

Hi!
I am in charge of a labotory with 4 PC's, without any servers... I create users' account locally on specific computers considering their needs in terms of softwares they need to use.
I would like to "export" all my local accounts per machine (i.e. user's login, infos and password, not their data) in order to recreate all those accounts lately in case of a system crash...
Is there any free program that can "export" users as VBS scripts for example to create the users and set their infos and password automatically ????

Thanks in advance..
Julien