PRIVATE INFO STORED BY GOOGLE: recorded audio – before & after “OK Google”; iHeart music I play, youtube videos I watch, GPS map searches, web searches… 
“Google knows more about me than I do!”- Chris Ching
“WOW! I followed up. I had no idea that Google was collecting so much info. And I thought Chris Ching's email was an April Fools Day joke!!” – Steve Miller
My brief exploration showed innocuous audio  recording , both before and after "OK Google".  HOWEVER, it raises my personal alarms - what all is being recorded??? - and at least part of it appears to be my personal info, downloaded from a GOOGLE site!
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BACKGROUND: 
http://www.independent.ie/world-news/google-voice-searches-records-and-keeps-conversations-people-have-around-their-phones-but-the-files-can-be-deleted-35582500.html 
Instructions/settings DIRECTLY FROM GOOGLE: 
https://support.google.com/websearch/answer/54068?hl=en 
SEQUENCE TO SHOW PRIVATE INFO:
 - SAMSUNG S4: Settings > Accounts > Google > Search > Accounts & privacy > My activity.
 - SAMSUNG S6: 
" Settings" (within "personal" grouping) > "Google" > "Personal info & privacy" 
[at some point, I had to enter my google password – screen states that "only you can see this data" 
I have 2 Google email addresses and password – it appears they are both linked to my other non-Google email addresses] 
> "Privacy Checkup" (NOT EXPLORED) 
> "My Activity" (BRIEFLY EXPLORED) - records ALL my Google & search activity!!!! 
"Activity Controls" > "Manage Google Voice & Audio Activity" > "Voice & Audio" 

Chris Ching email: 
Chris Ching email:  SUBJECT: Google voice searches records and keeps conversations people have around their phones - but the files can be deleted - Independent.ie
Steve, 
Thanks for the interesting info you shared yesterday at FRA! I’m doing the backup and update on my phone now. 
I saw this article about Google keeping records of conversations people have around their phones and thought you might want to address this issue at one of your future workshops. 
It’s a scary thought—wondering if everything I’m saying is being recorded all the time! I’m much less guarded about what I say when I think no one is around (except what I thought was just a dumb phone) than I am when others can hear me! Now I have to be wary that this thing I’m carrying around with me all day might be recording everything I’m saying?! 
I tried to follow the article’s advice to check the phone’s History for the recordings, but I couldn’t find such a folder on my Galaxy S4. I checked under Settings > My Device > Voice Control to see what was configured. I turned on voice control for Incoming calls, Alarm and Music, but not Camera. Perhaps it only listens for voice commands when those apps are running…. 
Anyway, I hope you find the article of interest. 
Chris Ching 
E-mail: c.ching@rocketmail.com