Hi Hannah.
My first thought was "what a waste of money for something that one can for oneself with very little effort and close enough to zero knowledge or cost.
Then I thought about the number of otherwise intelligent people who come to me in near panic because their system has crashed and ... you guessed it .... they have no backups at all.
Yup. I'd never use it, nor (I imagine) would anyone here, but it could save a lot of people a lot of grief. I certainly have customers who ought to be using a service like that, because I know darn well that the alternative is no backups at all.
Oh, one other thing: by using that service, given the latest mania for destroying the last remaining civil liberty laws in the USA, you can be virtually certain that the FBI and the IRS will have full access to your accounts any time they want to. But I doin't think that's the problem it seems like on first sight: accounts are one area where the IRS and equivalent bodies have pretty much open access anyway, and have had for many years. But there is absolutely no way on earth I'd recommend that anyone use such a service for non-accounting records.