@TdeV - How about running calibre-server on the desktop, and accessing the library on your lenovo via a browser - has search and rough equivalent of 'tag browser', and you can download books
With appropriate precautions you can access the server over the net - does mean to desktop has to be on all the time.
Assuming it's a windows lenovo you could maintain a copy of library on dropbox via a file synch process, and have the lenovo use calibre to access that library.
BR
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