Backends implement the Collection API and provide persistence and search. Backends live in grassyknoll.backend

Current Backends

• LuceneBackend
• DictionaryBackend
• SqliteBackend
• ClientBackend: a "backend" that acts as a HTTP client to another, remote GrassyKnoll server

Desired Backends

• DbmBackend: see  issue 47 
• FileBackend: via pickles to directory tree
• MetaKitBackend
• S3Backend: maybe like a proxy? eh.
• ZopeBtreeBackend: Zope B-Trees are probably a better fit than the full-blown ZODB