New phone, how do I not lose data.

[KenY59]

Have traded in my S21 for a new S25 and cannot get my Samsung Health data to transfer.  As a matter of fact, each time I have gotten a new phone, I have lost all my old data.

[doley]

I just posted something about my health data not syncing on my S21. I'm not trying to transfer, but I wonder if it is related to the same syncing issue I believe they introduced in a late September update

[LongHiker]

@KenY59 If your Samsung Health is syncing with your Samsung account, and you use the same Samsung account on your new phone, you shouldn't lose any Samsung Health data. 

[Robin621k]

Are you using Smart Switch to transfer your data?

I have never list data moving to a new phone. I also don't lose watch data when transferring to a new phone.

[Chiicken]

Have you tried backing it up or syncing it ? But I believe all my phones have done that as well.