The free country has a list of free backup utilities
There are 2 options I see there that appear to fit your needs.
- Macrium Reflect Free that sounds like it could do the trick with a scheduler, though you may have to purchase the full edition to get compression. It appears to be reasonably cheap $40 or in that range.
"This software is able to image your currently running system (using a facility known as Microsoft Volume Shadow copy Service) to another local hard disk, to the Network, a USB or Firewire drive, and DVD. It has a built-in scheduler, so that you can schedule it to back up your system at a convenient time by itself, has 32 bit and 64 bit versions, comes with a Linux-based bootable rescue CD as well as a BartPE plugin, etc. (The commercial full version includes the ability to automatically verify images made, password protection of your images, a Windows PE 2.0 rescue CD with RAID support, etc.) "
- Bacula Appears to be the open source enterprise version
"Bacula is a set of Open Source, enterprise ready, computer programs that permit you (or the system administrator) to manage backup, recovery, and verification of computer data across a network of computers of different kinds. Bacula is relatively easy to use and efficient, while offering many advanced storage management features that make it easy to find and recover lost or damaged files. In technical terms, it is an Open Source, enterprise ready, network based backup program. "