Export your data from Gmail
A Google-adatok letöltésének menete
https://support.google.com/accounts/answer/3024190
Export your data from Gmail
https://support.google.com/mail/answer/10016932?hl=en
How to download your Google data
https://support.google.com/accounts/answer/3024190
Download data:
https://takeout.google.com/?pli=1