[gruez]

if the software is cloud agnostic, wouldn't a simple copy operation between the cloud providers suffice?

>security breach

if you want to reduce your attack surface, copying your data across multiple providers is counter-productive. instead of having to hack your specific cloud provider, the attacker only needs to hack one of many cloud providers.

[zaarn]

In some cases a copy might not be viable, especially with price hikes. If AWS increased storage and outgoing data costs greatly then exporting all your data will most likely cause a much larger bill.

Splitting your data across multiple vendors protects against all kinds of failures from all sides (including the vendor simply closing your account for no reason)