Back up iPhone to Time Capsule
How do I backup my iPhone SE (2nd gen) to Time Capsule?
iPhone SE, iOS 15
Question marked as
Not possible directly.
Possible indirectly if you are using Time Machine to back up your Mac......and.......you are also backing up the iPhone to your Mac. Then, .when the Mac backs up to the Time Capsule, the backups of the iPhone on your Mac will be backed up as part of the package.
If you are not sure how to back up the iPhone to your Mac, see the details in this Apple Support document: