How do I script backups

[kgasman]

I created a patient database for my wife. I would like to create a backup script that would run on closing the database. Ideally it would keep backup1, backup2, backup3 in a folder and would replace the oldest backup with the next backup. That way she would have the three most recent backups in case the database became corrupted or she accidently erased data. It would be great if it was time stamped so you would know when the backup was made

Any ideas?

Thanks for the help in advance