Storage Oscilloscope Tek 434 (was Re: Repair broken Tek 485 or buy good used 2465/A/B?)

OK, I have a question for the group. Gonna deviate a little here from
the original post...

What is a "Storage Oscilloscope"? Is there anything it can't do that a
normal oscilloscope can (for mostly audio purposes)?

I have a chance to get a Tek 434 locally. Anything I should know about
it? Any big problems with it?

Also, would the probes be compatible between the 485 and the 434?