I don't understand your problem. You said your Calibre library is 60Gb. You also said your specific backup method requires you to have double that space. You currently have 99Gb available on your SSD where your existing 60Gb calibre library is resident. You only need 60Gb for the redundant copy. Why won't that fit into the 99Gb of free space that you have?
I must have mis-read or mis-interpreted what you are saying. I don't see the problem.
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