Time Capsule: Options after macOS support ends

I currently use Time Machine to back up to the Time Capsule. The Time Capsule is also the router (with other Apple network "extender" devices in my home). Given that the Time Capsule will no longer be supported by MacOS27+: 1. Can I add a NAD external drive to the existing Time Capsule and use the NAD as the destination drive for Time Machine Back ups. 2. Can I use the Time Capsule drive as a general storage drive (i.e. Not from Time Machine); 3. What are the pros and cons of this approach v's buying a new router and sunsetting the Time Capsule when it is still working perfectly well?