I think for most of the storage backends, they have a rather good interconnection.
There is a P2P storage backend: Introducing cloud storage in the blockchain with Sia and Nextcloud
Or just keep a backup outside your location. There is no automatic failover procedure but your data should be save as well. As far as I know, they started to work on global scale implementations Nextcloud announces Global Scale architecture as part of Nextcloud 12. They probably look for more partners interested in investing in such a feature.