> The TTV(Tech TV) channel has been sold and it's website 
> might go down.  Will a mirrored website work if the 
online 
> website has been deleted?
Well, good question. The only way to answer is to actually 
make the mirror, and test it.

There are many potential problems:
- complex javascripting
- java/flash/etc..
- external sources

Try to mirror a small part, and run it offline. You'll see 
what you get.