I've been doing my Time Machine backups over my home network since Time Machine was released. It's a great system. With one bug. Every once in a while, my computer will tell me that there is a problem with my backup, and it has to create a new backup. This is unfortunate because these backups are very large, and I may not have room to keep both, the active and the "archived" old one. And losing the old one means loosing the distant history of backups. I like having a long history of backups so I can recovery a file from many years ago if I need to.
But fear not! This is a great article explaining how you can repair a network Time Machine disk image if it ever "goes bad". The process is slow and kind of technical, but it works!