You could consider storing your library in Dropbox or using BitTorrentSync or something to duplicate your calibre library across multiple machines. The important thing is, you must makes sure to sync all changes before opening calibre or you can have edit clashes which move things around randomly. Also, never sync while calibre is running.
BitTorrentSync is an interesting option, because you can make a one-way clone of your files on another computer, thus freeing you to do whatever you want -- even if both computers access at once, all changes or breakage on PC#2 will be overwritten by the canonical library on PC#1.
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