@Hawkerpaul 

It should be stored on the router itself. I think you could also customize the hostname on the clients themselves. Not all devices support it but you should be able to set the device name on the mobile phones.

I do agree that it would be nice for Deco to support network backup.

  @Heidi_Alp 

Thanks Heidi.

Yes, I agree, and all devices that I can do this with I have.

Its all those Smart bulbs are the main gripe, as they all come through with their factory name, so I had to switch each off and on in turn to try to work out which was which in order to give them a more logical name.

I guess I should have made a note of all their factory default names before I renamed them :)