Backup my iPhone X ios 16.7.2 to iMac running macOS High Sierra 10.13.6. ios
I have an iPhone X (10) running iOS 16.7.2 and an iMac running macOS High Sierra 10.13.6. I haven't upgraded the OS on my iMac because Catalina etc are incompatible with my iMac 27" Mid 2011 2.7 GHz Intel i5 serial number D25HX04CDHJV. So I am unable to backup my phone to time machine for some time now. Please advise how I can create a backup