[akkartik]

Email is only part of my electronic memory. Over time it's become more important to me to maintain my own copies of my memory on devices I control. The forms and formats are many, and they all need a commitment to maintain control. So yes, use email over more mutable media. And avoid remotely mutable extensions to emails. And keep a local copy of your email. And maintain date-stamped archives of stuff you work on, and keep your codebases easy to run from any point in their history, and write good notes. Constant vigilance.