recovering backed-up data on an iphone that is now lost
In early September of 2018, I backed up my iphone 7. I then lost the phone itself in late September. I began using an iphone 4, which seems to have recovered some photos but not all photos from the iphone 7. The iphone 4 cannot run the new ios.
So: I now have an iphone 6 and I'm trying get the photos and back from that early September 2018 back up.
I see the Sep. 3, 2018 back up in my options.
My iphone 4 cannot be restored to take that Sep. 3 2018 back up, because it cannot use the new ios.
If I restore the iphone 6 I now use with the Sep. 3 2018 back-up, I'm concerned about losing everything created and used on the two iphones (4 and 6) that I've used since I lost the iphone 7.
The iphone 6 obviously has the up to date ios, but if erase everything on it and restore it to Sep. 3, 2018, that will not be ideal.
Thoughts? Thanks!
iPhone 6, iOS 12