BTW, my preferred method of backing up my libraries to use calibre's export/import and then storing the files on an external hard drive, cloud storage and NAS. So far I've been lucky and chosen when to change hardware but a couple of acquaintances have suffered catastrophic failure on their computer hardware. The one who was exporting their library as a backup had a lot less issues restoring their library than the one who was backing up their library ebook files only.
The export is tested by being imported on a VM (Windows, Linux or MacOS depending on what I feel like using). One thing I learned early in IT is that a backup that isn't being tested isn't worth having.
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