After 10 years as an AWS customer and open-source contributor, they deleted my account and all data with zero warning. Here's how AWS's 'verification' process became a digital execution, and why you should never trust cloud providers with your only copy of anything.
Local storage backups (local to the servers wherever that is, so “relatively local”) should be the initial backup, then those backups should be what’s synced to the off-site/third-party provider, generally. But it really depends on the types of tech and how those backups are generated.