Backup fails "HomeyBridgeTimeout" (but I don't have Homey Bridge)

Anybody have any idea why Backup fails with “HomeyBridgeTimeout”, even though I don’t have a Homey Bridge?

Memory and Storage are both below 50% of capacity

(Obviously I submitted a support ticket but “expected reply time is 2-3 weeks”)

Homey Pro has some of the internals of the Homey Bridge on board, and while communicating with this part a timeout occurs. It’s unclear why, other than doing a reboot or PtP there’s probably nothing much you can do.