If you're upgrading to macOS Golden Gate and you have an AirPort Time Capsule, Time Machine won't be able to back up to it. macOS 27 removes support for AFP, the legacy file-sharing protocol that Time Capsule relies on for Time Machine backups. Said backups now exclusively use the SMB protocol, which Apple's discontinued Time Capsule hardware does not support in the form required by macOS 27.

Apple warned users about the change back in June 2025 when macOS Tahoe began displaying a warning that Time Capsule backups would no longer work in the next macOS. Users still backing up to one will need an alternative, such as an external drive or a modern NAS.
This article, "Reminder: macOS 27 Ends Time Machine Backups to Time Capsule" first appeared on MacRumors.com

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