You could if you are very careful do a search for all epubs etc. and copy them to a backup directory but why, will come back to bite you in the ass possibly with an interrupted copy etc.
I archive mine regularly and keep a pretty current copy in several places. I keep every format and a zillion (it seems) PD books and with original file tweak on so my backups are in the 50 gig range but I'd rather be safe than sorry.
Helen
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