there's a sort of cheat, if you want to ensure that calibre keeps an original. Do a conversion to same format in calibre before doing anything else to the file, so that a title.original_whatever file is created, then be careful not to delete that. It's not an approved use of original format, K says somewhere that it is not meant to be relied upon as a backup, but it may help. Also, not sure if you can do that with .docx, it works for AZW and EPUB which are the formats I use.
otherwise you need to create a column or use a comments field or a tag
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