An easy backup server solution

[Gorilla]

RESTORE was developed by Holonyx Ruffdogs and is a free, open source, enterprise network backup and recovery solution for Windows, Novell, Mac OS X (data fork), Unix and Linux systems. RESTORE is scalable to a complete backup solution for multiple workstations, servers, and data centers. It operates over local area networks, wide area networks, and the Internet. Holonyx Ruffdogs is placing RESTORE into the open-source community.

RESTORE is a user friendly web-based backup system. With this open source restoration program you can backup files, folders or directories with a few easy steps. RESTORE offers many protocols and ways of accessing your data to both backup files from, or restore files to.

Available at: Welcome to the RESTORE Website
Lifehacker's neat little post about it: Feature: Create Your Own Cross-Platform Backup Server

Its based on Ubuntu and it looks like a nice solution for a spare machine to meet back up needs.