def backup(self, dirname, username, password, since=None, before=None, stamp=False):
'''Performs backup of your GMail mailbox'''
self.notifier = ConsoleNotifier()
where = ['ALL']
if since:
since = _convertTime(since)
where.append('SINCE')
where.append(since)
if before:
before = _convertTime(before)
where.append('BEFORE')
where.append(before)
b = GMailBackup(username, password, self.notifier)
b.backup(dirname, where, stamp=stamp)
