I am going to pray that you donāt see the dreaded you canāt use this backup message. But if you do, itās not the end of the world.
Hereās what I would suggest-
First check out tonight when your last backup is done. Is it tonight? If so AND the phone comes with 17.01, then you wonāt have any problems.
The real only problem that could mess up the build of the new phone is if your old phone is newer than the new one in its IOS version.
The year that Apple did this to us, I just stopped and got the backup to be the same version. Then everything will work fine.