You can easily do that using a search and the Save-to-disk toolbar icon, but calibre also has a full-featured command-line interface documented here:
http://manual.calibre-ebook.com/gene...cli-index.html
Use `calibredb search` to obtain a list of ids for the books you want (assuming the list is not static).
And use `calibredb export --to-dir=/path/to/GDrive/saved/folder id1,id2,id3,...` to export them.
Or combine them together. In bash this would be simple:
Code:
calibredb export --to-dir=/path/to/GDrive/saved/folder $(calibredb search 'some search string')
but I don't know that Windows' cmd.exe has command substitution capabilities.