Comment 2 for bug 739045

This is also an issue for me, but also leads to a bigger question:
  Why does Calibre need to have write access to existing book files in the library?

 Surely this means that backup software will flag changes when it doesn't seem that there would need to be any?

i.e. my file of Ulysses from Project Gutenberg shouldn't change whether it is on my ereader or not and so shouldn't need to be backed up if nothing else has changed...

Or am I missing something deep in the design of Calibre?