Preferences ==> Advanced ==> Miscellaneous
There is a button "Open calibre configuration directory" (see screenshot)
Also, many settings are contained within the database itself -- all the custom columns and anything else that is set per-library.
Just copy this folder to your backup, reinstall, then move it back to the same location (check the File Browser path).
Last edited by eschwartz; 02-04-2014 at 07:24 PM.
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