Hi,
if we do as you said, we get the " clicks" ," conversion rate" etc, for the old one
for example:
1. we have adgroup named " Tables" -> they have the date of " clicks",etc
2. As you said , we can rename it and make as "remove" ( Tables_2020),
3. Again we are adding adgroup named " Tables"
is we get the clicks and other data's as it is ?
Thanks