First, it's super unlikely you're going to be hit by ransomware unless you're doing some pretty silly things.
Second, a drive that's not mounted (a rotated backup, for example, or one that's ejected) isn't susceptible to anything, because it's not accessible.
Third, a mix of backups -- local, network Time Machine, network SuperDuper, and -- yes -- cloud, like Backblaze -- means you're really well covered.
I really don't think this is something that you should be worrying about too much...
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--Dave Nanian
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