Google has been sending out emails warning users that any Timeline data older than three months will be deleted unless you choose otherwise.
The deadline for this change is as soon as November 19, although some users have also seen a December 1 deadline.
The email includes a link to retain your location history, but it looks like this option is nuking Timeline data for some people.
Google announced a major change to its Timeline location history feature in December 2023. This change will see Google Maps saving your location history on-device after years of storing it in the cloud. Now, it looks like the deadline for this change is fast approaching.
Android Authority colleague Adamya Sharma recently received an email from Google notifying her that these Timeline changes will take place from November 19. This differs from a previously reported December 1 date, although it seems like people are getting differing dates to begin with. Check out the screenshots below.