Non-admin users and Time Machine

We have a 1-1 laptop program with 7th and 8th grade students. The students are not admins of their own laptops.
This year we gave each student an external hard drive and had them use Time Machine to back-up their accounts. The problem was when a student needed to restore from Time Machine, we needed to enter the administrator's password.
We'll be switching to Lion over the summer, and by default, a non-admin user cannot even turn on Time Machine without an adminsitrator's password, which makes Time Machine useless. I don't want to have our students go back to manually dragging and dropping all of their school data (and movies and music) to back it all up (what a messy process).
Is there any way around the need for an admin password to use Time Machine?

Time Machine (the application) is already allowed. That's not the problem.
In order to set-up Time Machine the first time, users have to open the Time Machine Preference, and that is locked. When a user tries to unlock it, they need to enter an administrator's password, but our students are only standar users.
We don't want to have to enter that password for 250 machines each time students need to access that preference.
In addition, an administrator's password is needed to restore anything from a Time Machine drive, and we'd like a way around that too.

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