Quote:
Originally Posted by Quoth
Use "Export" and make a backup. Then to be sure to be sure make a copy of the "Calibre Library", and all sub-directories, or whatever it's called. Store those on something else (like USB stick, SD card, USB HDD, another PC, but probably not a Cloud Service unless it's your own hosting and a private subdirectory).
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Of course -- but IME, practical issues created by schema changes tend to show up many use cycles later, when it's infeasible to unwind anyway.