cbbackup does not work

Hi,

I try several way to backup my cluster but it always fails.
My cluster size --> estimated 537331029 msgs

1st method: use cbbackup with cluster url
/opt/couchbase/bin/cbbackup couchbase://127.0.0.1:8091 /backup/2015-02-12 -b profile u myAdminAccount -p myPassword

I have some segmentation error during the backup. I launch it a least 5 times but it always fails at different moment with the same error : segmentation error.

2nd method: use cbbackup with couchstore
Result:
/opt/couchbase/bin/cbbackup couchstore-files:///data /backup/2015-02-12 -b profile -u myAdminAccount -p myPassword

Exception in thread s0:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 763, in run
self._target(*self.args, **self._kwargs)
File "/opt/couchbase/lib/python/pump_bfd.py", line 592, in run
if (self.bucket_name(), self.node_name()) in self.cur['snapshot']:
TypeError: argument of type 'int' is not iterable

i have a weird path in my backup folder:
/backup/2015-02-12/2015-02-15T085843Z/2015-02-15T085843Z-full/bucket-profile/node-N%2FA/

Do you have a way to backup my cluster properly ?

The only method that works for the moment is to create a new cluster and use the XDCR ...