A new GitHub project is trying to retrofit Apple’s discontinued Time Capsule with modern SMB support. If this works, Time Machine backups to and from the hardware will still work, even after Apple kills it off in macOS 27.

Apple AirPort routers

Apple AirPort routers
Apple stopped developing its AirPort lineup in April 2018. Devices like Time Capsule have static firmware that doesn’t match evolving SMB protocols or modern security requirements.
The company’s decision to leave the router market wasn’t by chance. Apple decided to concentrate on products and services with more promising long-term growth.