Windows 7 does not provide any built-in quality backup software, but luckily, they provide a free product called SyncToy.
The product is very easy to use. You create a folder pair which are to be synced. You can choose to synchronize, echo or contribute; the former being the default, and in my eyes the expected behaviour. Using the synchronize setting, any changes you make on either the two folders, will be copied to the other folder. This allows multiple computers sync, e.g. photo from a server to multiple computers, where all editing will be synced to all computers.
The only real drawback, is that syncing must done manually. The changes are not synced in real-time. The help text provides an easy way to schedule a synchronisation event; using the Task Scheduler in Windows.