1. Take out
2. IMAP to local email client. Take Out format not always great and you don't get attachments. So doing the IMAP can litteraly be your identicial backup. I simple created a trucrypt encrypted 30GB container with portable thunderbird on it. The I fire it up once in a while to replicate/sync.
I'm also doing what others have suggested both:
1. I've captured as soon as services became available my name on all of the significant email services and I do keep them alive.
2. got my own domain but I realized having it on GCE cloud isn't the best idea. I may retain the domain but will need to the replicate my server onto diff cloud. Guess will need to think that through.
yeah I feel your paranoia.
Side note: I'm also wondering with their AI/ML. If I could get a psych profile based on my emails, searches etc... that would be an interesting read. I mean they have my searches and emails which they've scanned and profiled since their inception!