Admittedly, not an originally idea ... but I can't seem to find a company (at least, not many) offering the following w/ some level of service guarantee. The idea is essentially:
Er... why would you want your personal or company's data sitting on someone's PC somewhere in Russia or Nigeria?
Er, you would most likely heavily encrypt it before sending it out
I don't think this would work because of simple economics... hard drive space is so much cheaper than bandwidth. I can buy a 250 gig drive for 120 dollars, whereas to transfer 250 gigs of data over the internet in a short period of time would require a fairly expensive connection. Just get a simple raid5 setup...
Preallocate a couple tons of gold for the lawyers because if there is any "illegal" data being stored on your servers, you have a major liability. Copyrighted material, child pr0n, terrorist information, how to build a nuke, take your pick, if you store it you're going to get a visit from the feds.
You might find this interesting:
Try BitTorrent on Google.
> but I can't seem to find a company (at least, not many) offering the following w/ some level of service guarantee
Because there's no gaurantee I could retrieve my data later?
Take a look at www.312inc.com
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