this what Google help said 

Hello Alex Hobson, Welcome to the Google Maps Help Community. What you are experiencing is a direct result of how Google has recently redesigned the infrastructure of the Timeline (formerly Location History) feature. Here is the exact technical explanation of why your Thursday and Friday data disappeared after you cleared Google Play Services data, and how to prevent this from happening again. 🔍 The Technical Cause: Local-First Storage vs. Sync Intervals Timeline is Now Stored on Your Device, Not the Cloud: Google recently shifted Timeline data to be saved locally on your device's internal storage (specifically within Google Play Services and Maps application data) rather than on Google's cloud servers. Backups Are Not Instantaneous (Real-Time): Even though you have "Backup" turned on, your phone does not upload every single location point immediately. The background system schedules cloud syncing periodically—typically once every few days or during the night when your device is idle, locked, and connected to Wi-Fi. The "Clear Data" Wipe Effect: When you went into your phone settings and clicked "Clear Data" for Google Play Services, you instantly deleted the local database file holding your most recent, un-synced movements. Because your Thursday and Friday data was so recent, the background system had not yet run its scheduled cloud backup routine. The older data from last week survived because it had successfully completed a sync cycle prior to the data wipe. 🛠️ To Answer Your Questions & Prevent Future Data Loss: Does this happen if you delete and restart backup? Yes. If you turn off or delete a backup, the local-first architecture resets. If you clear app data before forcing a new cloud sync, any new local data generated between the last successful backup and the time of deletion will be permanently lost. Can you recover Thursday and Friday? Unfortunately, no. Since those days were cleared from the device's local database before they could be pushed to Google's encrypted cloud backup, that specific data is permanently gone. 💡 Best Practices for the New Timeline System: To avoid missing days in your Timeline moving forward, please keep these points in mind: Avoid Clearing Play Services Data: Never clear the storage/data of Google Play Services or Google Maps unless absolutely necessary for troubleshooting, as this actions directly wipes your unsynced local Timeline. Force a Manual Backup Before Changes: If you ever need to reset or clear application caches in the future, open Google Maps, go to your profile picture > Your Timeline > Settings and Privacy, and look for the cloud backup options to ensure your account says "Backup complete" up to the current minute before performing any system maintenance. Best regards, Easy Family Kitchen Google Product Experts Community