addendum sorry i wasn't precise enought !
in my example :(with 15 books) initial folder contain 15 ebooks epub for about 9 Giga calibre folder contain 15 ebooks epub + 15 time the same ZIP (containing the 15 ebooks zipped) for 145 Giga
addendum
sorry i wasn't precise enought !
in my example :(with 15 books)
initial folder contain 15 ebooks epub for about 9 Giga
calibre folder contain 15 ebooks epub + 15 time the same ZIP (containing the 15 ebooks zipped) for 145 Giga