How important is this data? You think monthly is often enough?

I backup my important data every night and send it offsite the next day.
On machines that may not be *that* important... I do it twice/week.

Are you going to store the backups offsite?

Maybe you should look into some tape solution?
Even burn to DVD?
Even flash storage is cheap enough.

1gig is nothing. I don't see a need for a server just for that...

Is all the data actually stored on the workstations? If so, wouldn't putting it on a file server that is backed up on a regular basis make more sense? (Even burning the backup to DVD.)