Bare minimum: regularly scheduled 'take out' backups. https://www.google.com/settings/takeout https://www.google.com/settings/takeout There are lots of open s

Bare minimum: regularly scheduled 'take out' backups. https://www.google.com/settings/takeout https://www.google.com/settings/takeout There are lots of open source utilities to work with the data, but most are one-offs. Here's one that didn't appear to be: https://github.com/jay0lee/got-your-back/wiki https://github.com/jay0lee/got-your-back/wiki