I was too much enthusiast...
As the number of books increase, the transfer rate is going lower and lower.
52minutes needed to transfer 683 books.
I'm afraid of the future, since I've only transferred 4559 books ...
May I suggest one thing ? Since I faced the problem because I changed my smartphone, but keep the same SD card : Wouldn't it be possible for you to add a saving capability for the Data base (different from the Library) ? For example, someone, like me, want to change his phone but continuing using the same SD card . On the old phone, CC will save the data base on the SD card, then install CC on the new phone (with old SD Card), and import the data base and that's all, Books are in the same place ...