javascript:void(open('https://web.archive.org/save/'+encodeURI(document.location)))
The example uses a dummy email address. You may fill in your own to be notified of whether the archiving is successful or not.
javascript:void(open('http://www.webcitation.org/archive?url='+encodeURIComponent(document.location)+'&email=foobar@example.invalid'))
javascript:void(open('https://archive.is/?run=1&url='+encodeURIComponent(document.location)))