Deleting original ebooks after adding to Calibre library

[DNSB]

Originally Posted by Userin

I was browsing the internet in search for an answer to the same question and somehow found this thread. Having read it, I registered an account to humbly present you with a prize as in my lifelong adventure with text I have never seen an answer to a question that would be as useless as yours. I still have no idea whether I can delete the duplicate from Calibre or not, but at least I had the pleasure of reading the response from fussygoat who told you in the most polite way possible where you can put this completely uncalled for advice of yours.

I would not consider advice on maintaining multiple backups as being useless. And yes, back in 2014, DVDs/CDs were still commonly used backup media.

And did you perchance miss message #4 in this thread where @spiralmind4 mentioned comparing the original books to the copies in the calibre library before posting your reply?