Re: @ nuclearstar Unsurprisingly, it seems someone has
Assuming the blockchain is duplicated in each online wallet and assuming it hits 1TB at some point then an online repository with 1000 users would require 1PB storage.
Sure, but there would be no need for that. If we're talking about general purpose "cloud" hosting being used for bitcoin, than I guess it would work out like you said (unless they used dedupe). But a purpose built bitcoin service would certainly not work that way. A "wallet" is really just a collection of private keys used to prove ownership of an address when spending coins from it. Mine weighs in at 96kb. Since the blockchain is the same for everybody, all the users could share one copy.