Ask HN: How to safely migrate Google apps data to new domain name?

[sudheendrach]

I'm trying to migrate all our Google apps data to a new domain name. I'm very new to this, hence would like to understand from startup folks who've changed their company name/domain and the process you followed to safely migrate all the data (emails, calendar, docs/drive etc.) and also anything you'd advice us to keep in mind.

Would really appreciate your help!