I have multiple libraries, for similar reasons.
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... a staging library where I can work on book formatting issues without accidentally overwriting the originals files ...
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Rather than a separate library, before I start editing a book's content I copy the format file(s) I have into the book's 'data' folder, and then edit what's in the library.
If I want to discard the edited version, I use
calibre->remove->remove specific format, to put it into calibre's trash can, and then add what's in the data folder into the book - usually via file manager->copy and calibre->Add books->Paste from clipboard.
Because the format file editors (ebook-edit, sigil, word, pdf-xchange-edit, WinRAR etc) are separate processes, when I'm editing something in one library I can switch to another library, providing I don't do something stupid while I'm there.
I use a File Sync tool (GoodSync) to backup
all all of my data, including calibre libraries… it won't run if anything else is running.
BR