Is there any solution for this problem in the works? It's been a long time since there have been any upgrades to the firmware... If a downgrade fixes it, where can we get the older firmware?

See this for anecdotal confirmation of my hunch: https://www.jessesquires.com/blog/2020/01/10/time-machine-failing-on-macos-catalina/

My hunch is that this problem results from changes in Catalina's handling of Time Machine disks that TP-Link's firmware hasn't been updated to handle. I say this because my wife's computer running...

I have a C4000 that is about 8 months old. A few weeks ago, I plugged a USB 3 drive into the USB 3 port and set it up as a Time Machine backup destination. That has worked well. Until today. Today,...

The C4000 has two USB ports on it. I'm able to plug USB drives into each of them and they show up on the router setup page. It seems, though, that only one of them can be used for Time Machine...