This is more a reminder than an actual advice because I think we forget about too much awesome tools over time.

Some days ago I was searching for the reason of a bug in production that couldn't be reproduced. The page where the solution should have been didn't exist anymore (it was a documentation page from microsoft) and I was a little fucked until i remembered the wayback machine. With that wizardary tool I was finally able to get the page's content from more than a year ago and with that I got a potential solution to solve the bug.