Backup iphone on iMac running HIgh Sierra
I have an iPhone XS running iOS 13.7 and an iMac running macOS High Sierra 10.13.6. I haven't upgraded the OS on the Mac because Catalina is incompatible with a couple of apps that are critical to me (an issue I'm dealing with separately). I want to back up the iPhone to my computer before upgrading its OS, and now that iTunes has been crippled that does not seem to be possible. I prefer not to back up to the cloud, and it's more than a little infuriating that there seems to be no alternative.
Is there some way to back up my iPhone to my computer?