Quetion about Time Machine as backup for college student

[rgG]

My daughter will be heading off to college in a couple of weeks with her new MacBook Pro and a portable external for backups. I would like to just let her use Time Machine, since it is so easy, and, if it is easy, it might actually get done. Is there any reason she should do more of a backup than TM?

BTW, she usually emails document type projects she is working on to herself, so they will be stored offline and accessible from other computers, and I think this is a great idea.