Proposes a name for the backup file.

			Keyword arguments:
			path -- temporal filename

def get_backup_filename(self, path):
		"""Proposes a name for the backup file.

			Keyword arguments:
			path -- temporal filename
			"""
		head = datetime.utcnow().replace(tzinfo=pytz.UTC).strftime("%Y%m%d%H%M%S")
		self.backup = "stations/backup/%s.%s" % (head, path)
		return self.backup