Official way to upgrading from Epix2 to Epix Pro and keep records my data etc.

Use the restore feature.  Most of the settings backed up from your E2 will transfer to you EP

Thanks Dan, Where is the restore feature found, on the watch, in Garmin Connect or in Garmin Express?

OP, I just went through this process yesterday when I upgraded from the Epix2 to the 51mm Epix 2 Pro.  When adding the new watch in Garmin Connect, it specifically asks if you want to transfer the data from the current watch to the new one.  

I haven’t checked everything yet but it seems like it worked. My alarms, workout/exercise preferences, and other notification options transferred over. I had to go through some setups for some 3rd party apps like Strava and my previous watch face didn’t transfer over but overall, it was a painless process. 

I hope you enjoy the watch as much as I am. A 51mm AMOLED is welcomed for my aging eyes

Thank you Jiman. I haven't quite gt the wrist size for the 51mm but it would have welcome for eyes also.

I saw the data transfer prompt and like a fool i did not accept.

I hope there is a way to to re-prompt the question.

I tried deleting it from Garmin Connect and re-adding it but no joy.

Can you definitely restore to different devices?

I thought you could only backup and restore to same device.

Cobra said:

Can you definitely restore to different devices?

From the link I posted.

Backups can also be applied to a different compatible watch. For example, if you get a new watch you can transfer settings from a previous watch to the new one, provided both are compatible with this feature. Check your owner's manual to see if your watch is compatible.

I successfully completed a restore from my Epix 2 backup to my new Epix 2 Pro.

I have all my previous activities

The History|Totals|Odometer remains at zero which is a shame but i guess everything is still in Garmin Connect.