My UDM died :/ -》buying UDR7

So my questions are:

1. What is your experience with UDR7?

2. Was it straightforward migration eg restore from cloud backup?

3. Do I need to take care of anything special?

I found one on our local market, with invoice, new, unused for some 250 euros…

Completely new can take up to 1-14 days to come… and i guess it will be more then 7 lol… and i can't wait so long

So any tips and tricks are welcome

Btw. It's not an option to do everything from 0. As i have multiple vlans, multiple wifi ssid, fixed ips etc etc etc (custom dns records….)