On the next screen select the new path for your library and click the option to “Move current library to new location”.First, click on your library’s name and select “Switch/create library…”.To move your library to another location: Say you have two hard drives and the one that has your collection on it is getting full. Then, find the source folder of your backup.This time select “Import previously exported data”.
First, go to “Calibre library > Export/Import all calibre data” once again.Now, to restore your library after a loss or move it to your new computer, you need to import it: You can then save it on a backup drive, burn them to DVDs or just stash them away somewhere safe.
This process will create a series of 1 GB-large files with your whole library.