I don't understand how you could use newsgroups for storage, except in a "I don't care about data loss" kind of way. I haven't used USENET in decades, but NNTP is a messaging protocol it says nothing about storage AFAIK. I do recall that back in the day, messages in busy newsgroups would expire rather quickly (probably due to limited storage on my news server at the time). So if I post a message containing my backup to a binary newsgroup, what assurance do I have that I will be able to get it back?