Google says a technical issue caused some users' Maps Timeline data to be deleted
Briefly

After reports of Timeline data loss among Google Maps users, Google has confirmed that a technical issue led to the deletion of this data for some individuals. Users who had enabled backups prior to the incident can restore their Timeline, while those without backups face permanent loss of their location history. Conversion to on-device storage has made backups less accessible by default, posing risks for users relying on location tracking. The issue highlights the importance of proactive data management for applications like Google Maps.
We briefly experienced a technical issue that caused the deletion of Timeline data for some people. Only users who had backups turned on will be able to restore their Timelines.
The incident caused some users to lose years' worth of location history. Some who had backups enabled were able to restore their data; others were not.
Read at Engadget
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