OK. My base Station is Version 7.8.1. My 2014 iMac Is using Airport 6.3.9.. And my OS is Big Sur 11.7.7.
Backups
I configure the Time Capsule to run with the Normal Time Machine Backup of the iMac. The initial back up did occur, but updates to time machine on the Airport Time Capsule are not occurring. The error message I keep getting is Drive not Visible".
When I go to Finder, I see the Network. I see the Extreme Time Capsule. I see the drive, I can send and receive data from the drive. But the Time machine won't trigger to save data to the Time Capsule.
Any ideas? Connection is Direct Ethernet, Wifi turned off. When I turn wifi on, it makes no difference.