What do you do with content on a site if they are transferring to a WordPress site?

One of our STWP sent me an email saying she wants to save all the content on her current, non-WP site to reference in the future. What is the best way to do this? Have the client copy and paste the content into a word doc? Or will the content be safe in the old site for an extended period of time?

This client is quite needy, and I would hate to lose the content. That would equal a very unhappy woman.

Thanks!