60Gb of online storage is easy to provide. The amount of data transfer bandwidth for a busy web site that big is another matter. Many personal sites don't get a lot of traffic but if it's full of media (pictures, music, video) it can suddenly get popular and the bandwidth becomes the limiting (or expensive) factor.

You are right that using separate web space is a possible temporary measure to get round a storage limit. If you need much more though, it's probably cheaper to just purchase more space on the same account.

Anahata