or
1) ARCHIVE (backup) your sources (to another drive, even off-line)
2) setup an Calibre auto-add folder
3) Drag and drop small batches to this folder. When both folders are on the same filesystem, it is a Move.
Auto-add deletes files from the folder, that it has added to Calibre. (the reason I had you Archive the source)
4) reload Auto-add until no more sources are left
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