I've been a part from the archiving community for a number of years. Is archive.is now considered the defacto standard for snapshotting sites?
No way!
web.archive.org is defacto standard for snapshotting[0] sites[1]!
[0] http://web.archive.org/save/https://news.ycombinator.com/ite...
[1] http://web.archive.org/web/*/https://news.ycombinator.com/it...