Documentation of /System/Library/Backup/Domains.plist. File taken from iOS 16.4 iPhone SE 3. The file was removed in iOS 17.0
Values in the plist. Other than SystemDomains, these are not really important and are just here for preservation sake.
A domain in domains.plist contains keys that determine what gets backed up for what types of devices and where (i.e. iCloud vs iTunes). Not all domains have each key. The only 2 keys that must be in every domain are RootPath and RelativePathsToBackupAndRestore. Some domains have the value ShouldDigest. I am not sure exactly what it means but I have included it for documentation purposes.
Version:"24.0"SystemDomains:(Dictionary), see below