Don’t update your Mac to macOS Catalina without doing some serious checking first. The new Mac operating system makes some deep changes, which means that at least a handful of apps on your Mac will break.
If you’ve updated to macOS Catalina, you probably already know that iTunes is gone and has been replaced with separate Music, TV, and Podcasts apps. So syncing, backing up, updating, and restoring iPhone
It's a good idea to back up your iPhone and keep a copy of your data on iCloud or an external hard drive. You can also store your iPhone backups on a Mac computer. But where exactly are your iPhone backups