Guys, I have a question on iTunes "Back Up" when acquiring a new iPhone. So my mom has her 6 Plus backed-up to my MBA. She now has an XS Max. I am taking over her 6 Plus and will be performing a factory restore. Question: In the future, when I perform a backup of any files, photos, apps etc. of her XS Max to the iTunes which has the 6 Plus backup on my MBA, will iTunes create a separate backup (apart from the 6 Plus) of the XS Max? Or will iTunes merge everything together; in other words, will the XS Max back up be combined with the 6 Plus backup? Does this make sense? Thanks.