If you keep separate libraries just for recovery convenience, I suggest you just consolidate them all and implement a robust backup strategy.
I personally have an autobackup once a week (sunday 19h30, using Duplicati) for everything in my profile, including my library. In addition I manually mirror my library (using FreeSyncFile) after an heavy Calibre session to my home server, where a headless calibre-server multi-instance is running 24/24.
And every night, the whole home server is backed up on my NAS.
I'm pretty worry-free on that front.
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