A colleague of mine always says that you don't have a backup if a single nuke* can take everything away. So even with soft deletion, versioning in itself would

A colleague of mine always says that you don't have a backup if a single nuke* can take everything away. So even with soft deletion, versioning in itself would not be a backup solution. OTOH, I'd bet Dropbox has distributed backups. * An exaggeration for natural disasters, wars, lock-downs, fires and so on.