Or download from gutenberg.org
I have separate folders for each source of ebook and then in Calibre "Add" the copy.
If you have the deDrm plugin from Git NoDrm 9or others) then "Add" also works with books with DRM (only downloaded, not copied from a device).
Calibre is pointless for Library ebooks. They need used directly. You don't ever own them. Kindle Unlimited is a Pay Library.
Backup the originals and the library.
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