edit: adjusted title slightly
15 points
You can (well, could) put in any live URL there and IA would take a snapshot of the current page on your request. They also actively crawl the web and take new snapshots on their own. All of that counts as ‘writing’ to the database.
6 points
Not just websites. Basically any digital media. From PDFs, book scans, manuals, floppy disks, CDs, basically anything even remotely worth archiving
2 points
Yep, but I didn’t mention that because it’s not a part of the “Wayback Machine”, it’s just the general “Internet Archive” business of archiving media, which is for now still completely unavailable. (I’ve uploaded dozens of public-domain books there myself, and I’m really missing it…)
