I have the same feeling. The third party providers of today are very inexpensive and amazingly flexible but I'd feel more comfortable to put the crucial data in powerful machines I could control.
(It is interesting to note that many, maybe most mainframes are not owned by their users, though: they are rented, if I recall well. Nonetheless, the user organization has much more control over them than, for example, over AWS servers. In practice, it is as if they had bought some really powerful box.)
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I have the same feeling. The third party providers of today are very inexpensive and amazingly flexible but I'd feel more comfortable to put the crucial data in powerful machines I could control.
(It is interesting to note that many, maybe most mainframes are not owned by their users, though: they are rented, if I recall well. Nonetheless, the user organization has much more control over them than, for example, over AWS servers. In practice, it is as if they had bought some really powerful box.)