Time Capsule? Or another wireless external?

[0186279]

Looking to get a wireless external, is Time Capsule the only one that will work with a MBP? I would like my external to back up whatever I do on my computer whenever I am within range. I've read a lot of fail regarding Time Capsules though : /

Any insight will help. Thanks : /

 

[netdog]

Time Capsules work well, but they are pretty pricey.

That said, I have two.