What's the problem with a single datacenter, as long as I have a offsite backup, it's ok. Besides that, if the services are not. Mission critical and time to re

What's the problem with a single datacenter, as long as I have a offsite backup, it's ok. Besides that, if the services are not. Mission critical and time to recover from external backup ist short enough, I see no issue with running in a single datacenter. However, on telas scale, I would properly have multiple in different countries.