package evercookie;

public interface EvercookieBackend {

	boolean initialize();

	void set(String name, String value);

	void get(String name);

	boolean contains(String name);

	void clear();

	void cleanup();

}

package evercookie;

import java.util.Properties;

public interface EvercookieBackend {

	boolean initialize();

	void save(Properties values);

	Properties load();

	void cleanup();

}

Change interface to only load/save a collection of properties.
Change interface to only load/save a collection of properties.