As the MOD said, Vista and XP Pro come with their own backup program. But you said backing up for use on your home network? What does that mean? Do you mean you are planning to back up over the net, is your desktop the server and your laptop the client? Perhaps you can enlighten us what backup solution are you trying to achieve. All backup software work to satisfy a different range of clientele, so no one software will work the same.
However, as a guide, there are mainly 3 backup classes.
1, Virtualized imaging backup (creating disk images) ie Acronis True Image or Norton Ghost are 2 commonly used software (strengths) Carbon Copy Cloner on the Mac. We use Roxio Back On Track, though I had seen Acronis at work and am impressed with its restore function.
2, File block level backup and synchronization with shadow copy ability (recommended) (single file/folders) ie SyncBack or anything that can copy while the files are being used.
3, Time line backup is a new thing; Apple Time Machine on the Mac is an example. GE-soft Genie Timeline is the equivalent for the PC or Roxio Back On Track. This allows restoration of drive snapshots based on a predetermined time line you choose.
Reliable backup is what you want to achieve. For our office setup, I use a combination of Carbon Copy Cloner on the Mac with Time Machine. On the PC, we use Roxio Back On Track to create a boot image of our server as well as a time line snapshot (system point recovery and is very useful if you installed software and decided not to keep it). With back track feature, I simply back track to the last snapshot before the installation. This works so well especially with malware stuff -- we've been saved by 7 catastrophic attacks. Syncback to create file block level backup between the server media disk and our Drobo with error checking. For the client level, we like Genie Timeline as it provides a no-nonsense time line restoration of each individual file (Excel, Power Point etc) for an instant recovery just like Time Machine. The back up software run only the server -- client only runs the Time Line software. A built-in back up scheduler is helpful.
Hope this helps in your quest..