What is new "Reset on new activity" option about on Google Analytics?

Question

Google analitycs announced today their new policy about data retention

Google Analytics Data Retention

Along with the option for choosing how long data will be stored (I chose do not delete data, obviously), there is an option "Reset on new activity".

I cannot find info about what is this option about. What they mean by 'activity'? If I don't switch it off, the option could be reset and data deleted?

Answer 1

It means that the counter for data retention is reset when the user visits the page again.

Image your retention period is set to 15 months.

User visits once = after 15 months the data is purged.

User visits. One month later the user visits a second time = second visit resets the counter, effectively user data is retained for 16 months in total.