I wish to filter and sort the books in Calibre with DRM and without DRM. I have 4000+ purchased books and some I have removed the DRM, however I have been unable to do this on all of them. I only want to do this so I have a personal backup in light of the recent behaviour by Amazon deleting whole Kindle accounts. 4000+ books is an investment and to lose it will be rather upsetting. I have no idea how to do this and wonder if this even possible. If not is there an alternative program to do this in? Even better to be able to export the non-DRMed books to new folder.
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