If you want to copy a database to an external drive it’s useful to know which items you have imported and which are just indexed. To find out in DEVONthink Pro or Pro Office, open the Search window (Tools > Search). Leave the query field blank, check Search for: All. Now click the Advanced button and enter these criteria: All of the following are true; Kind is Any Document; Instance is (not) Indexed. Click OK to start the search.
Note: You can save the search as a smart group. Click the “+” button to the right of the query field, then name and save the new smart group.