Who really needs more than a the minimal few gigs that Google Drive, Microsoft SkyDrive offer? I mean who is gonna sit there and upload 20,30,40+ gigs of shit when upload speeds across the board are normally horrible.
Is it these guys, or BackBlaze that offers a "seed disk" service?
Your initial load can be sent via hard drive. Probably worth it for that kind of volume, if it is all vital data.