How to restore delete data and keep new add data

I need to delete some old data from DB.

But I still want to backup them once they need to be restored anytime. Maybe some user need those data after I deleted them, thus, I have to restore them ASAP.

Once I delete the data, there still have new data add into DB.

I know full backup + transaction Log can store the delete data. But look like it only store the DB to the status before I delete. That means, all new add data will lose if I retore DB in this way.

Is there any way I can backup those delete old data, and restore it anytime, and keep the new add data?

Any feedback is really appreciate!