Most of the information is collected via Android mobiles since it is now mandatory to link a smartphone or tablet to a google account (which is not yet the case on PC ... but increasingly recommended .. .)
It's over there and it only takes a few minutes: https://takeout.google.com
Personally, I have more than 40 GB (are we having a contest guys?) And I have not yet studied the content of these 40 GB ... I only use Google Photo which, I thought, is growing of data (but it's limited to 15 GB ...) so the rest ??? 30 GB of zipped text file ?? Wtf!
How many millions of TB does that represent in all? How many data centers does Google need to manage the backup of the billions of Google users? What energy and environmental cost?



ps: my working browser on PC is not connected to a Google account (but I have another browser which is on the same pc and when I see this electricity-electronics-informatics / Remarketing-retargeting-amazon-exchange-your-information-with-facebook-and-google-t15158.html ...)