[blaenk]

I have my library full of epub books and a kindle device. I configured calibre to auto-convert to azw3 when I send to the kindle, but I only want to keep the epub versions. Is there a way for calibre to delete the converted format once it's been sent to the device, so that only the original copy is kept in the library?

The reason is that I keep my library synced to a backup service, but I have very slow internet and it kills me to have to upload each book essentially twice, especially when I only want my kindle device to have the azw3 as there's no reason for me to keep it around. A lot of my books are pretty big for epubs too, in the 30-80MBs in range (textbooks for example), which is very bad for my very slow connection.

I could manually go in and delete each azw3 right after I send the book, but that's a pain to do manually especially because the service I use watches my calibre library and immediately begins synchronizing the books as soon as they appear, so I'd have to be quick, which would be even more inconvenient for bulk sends.

So I'm wondering if this is possible with calibre: only keeping one format around, so that conversions due to sending to device are removed once sent.