IIRC, wayback machine has a pretty wicked flaw in that if a domain adds a restrictive robots.txt at some point (say, a domain changes hands), then all prior arc

IIRC, wayback machine has a pretty wicked flaw in that if a domain adds a restrictive robots.txt at some point (say, a domain changes hands), then all prior archives for that domain are retroactively taken offline. Not a problem for archiving things just to keep them online under heavy load, but it's a big problem for future use. I'd prefer something like archive.is for longer-term storage.