def failback(self, force_full_copy=None):
req_body = self._cli.make_body(forceFullCopy=force_full_copy)<EOL>resp = self.action('<STR_LIT>', **req_body)<EOL>resp.raise_if_err()<EOL>return resp<EOL>
Fails back a replication session.

This can be applied on a replication session that is failed over. Fail
back will synchronize the changes done to original destination back to
original source site and will restore the original direction of
session.

:param force_full_copy: indicates whether to sync back all data from
    the destination SP to the source SP during the failback session.
    True - Sync back all data.
    False - Sync back changed data only.