I run my power directly through the backup supply. I don’t use the in box DC adapter at all.I believe there are plugs for power and backup power. Did you incorporate this feature or did you simply run your primary power through the backup power supply?
ProfiLux 4 adapter for power cut monitoring – GHL USA
www.aquariumcomputer.com
The adapter you reference there is issued to detect a power cut but doesn’t provide power. I use this as well so if I blow a fuse I will get an alert from the profilux that the power is out at the tank.
Ideally I would get a backup for my wifi router and modem as well so I can also get alerts for an outage of the whole house ( I don’t have this yet).