AFTER GE deleting Activities

Not clear on what you are asking?  Did something delete all the History (activities) from your watch?  AFAIK Garmin Express does not delete from the watch when syncing??  I still have all mi e on my watch 7X Solar from the day I bought it. 
Assuming they did get deleted from the watch (Master reset?) next question would be why do you need them all back?  Not being critical, just curious. 

Yes. After updating GE on PC and synchronizing the watch, I discovered that all activities after February 2022 (!) have been deleted from the watch. This is the second time, the previous one happened in May 2022 and then also the Activities after February 2022 disappeared. I wonder what happened in Garmin that February 2022 is the limit date :)

raadiyoo said:

Cause exporting every one Activity and copying from PC to Watch - bad idea for me ...

You can bulk export some or all of your Garmin Connect activities, then copy as many as you want to your watch in one go:

[https://github.com/pe-st/garmin-connect-export]

There's really nothing to be gained by putting the activities back on the watch, unless of course you frequently look at past activities there. Yes it's annoying when GE does strange things but as long as the activities have been synced to GC nothing will change by putting them back.

Thanks! I will try :)

It's not about the Activities themselves, but about this uncertainty about what else GE can erase ...