"Cloud" is just someone else's server. Dropbox is currently under investigation for breaking privacy and copyright because they are switching to AI products and by default (if not in EU*, allegedly), they will scan all your content for their AI model.
The "cloud" won't wreck your Calibre library if used correctly, but a USB HDD left at a friend/relative's house can work out cheaper if you have a big library. Might be more secure and private.
[* seems they take more notice of EU regulations than Musk's X aka formerly Twitter]
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