Flipping a switch that says "Backup" does not mean you are handing your responsibility to them. At most, they will fail to meet their SLA, write you a check for according to the TOS and be done with it. At best, you'll be able to bitch about it on Twitter, possibly threaten a lawsuit (you read the ToS?) and still be in the same position because you did not share the responsibility of securing your data.
AWS Shared Responsibilities [1]
Flipping a switch that says "Backup" does not mean you are handing your responsibility to them. At most, they will fail to meet their SLA, write you a check for according to the TOS and be done with it. At best, you'll be able to bitch about it on Twitter, possibly threaten a lawsuit (you read the ToS?) and still be in the same position because you did not share the responsibility of securing your data.
[0] https://docs.microsoft.com/en-us/azure/security/fundamentals...
[1] https://aws.amazon.com/compliance/shared-responsibility-mode...