random business idea

provide an online backup service, but part of the startup is sending the user an external hard drive that they use to do a full backup and return to you before they start doing incremental backups over the network. for 40GB of data, it takes 10 days to upload at a fairly typical (but optimistic) 384KB/s.

mailing a hard drive can have much better throughput than pushing data up through adsl connections, but i wonder if the economics work out.