Maintaining document versions

if iam required to maintain versions of the documents of that i create in couchbase, is saving each version as sperate document the only option ? Iam looking for a better option since the document can sometimes grow upto 2MB and the changes between versions could only be minor (1-2 fields).

Does the DB offer anything like storing difference to save disk space ?

Reference : http://blog.couchbase.com/simple-document-versioning-couchdb