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Yes, nobody - like for example Apple, to implement Time Machine.

But now perhaps I better understand why Time Machine backups aren't supported on APFS.

we use encrypted sparsebundle images to hold sensitive data: ssh keys, SSL keys, license files. I doubt I'm the only one, this is pretty important to our business.

Eh, it's a minority but not an "almost nobody" minority. There are plenty of pieces of software even besides CCC that rely on/give prominent options for the use of sparsebundles.

It's more like "the latest OS update leaves you vulnerable to malicious javascript everywhere, but only if you use Opera". It's a minority of users, sure, but it's still really important information to note.