[vidarh]

Usenet messages and mail systems are both good old ideas (I don't know of any actual implementation, but it's certainly been discussed at least back to the early 90's).

For Usenet you could depend on widespread resilien distribution + reasonably long retention periods for a lot of groups (but risked having messages killed by admins if too obvious spam).

For e-mail, anything reflecting your e-mail back can be used to juggle data: Send messages with attachment, refuse to accept the inbound reflected messages for a couple of days to let the other party store the data for you while they retry, then accept the message and instantly send it back out again.

Then there's the old Linus Torvalds quote:

"Backups are for wimps. Real men upload their data to an FTP site and have everyone else mirror it."

[fatratchet]

Usenet is perfect for that since binary newsgroups for piracy have gotten really popular over the last few years. You can basically use it as a reasonably reliable key-value store that lets you store 300kb to 1mb blobs. Add some encryption and parity and you've got yourself nearly unlimited storage, even for free if you use trial accounts from certain providers.

[0x0]

Yeah, I remember reading about the e-mail reflection idea in the book "Silence on the wire", authored by "lcamtuf", the guy who's more recently known for writing afl-fuzz.