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.
First of all, the main backup should be on a system you own yourself. Preferably one you have at home, physically.
If this was a self-hosted forum, yes, that’s an option. But for professional purposes, a dedicated off-site backup provider is better than having storage at an office site.
In any case, I would still make regular backups of everything to a local storage.
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.