New multilanguage ROM from INNOS

[d6000i]

Him I have followed stevejc instructions to update to 2.3 international. Now I would like to update to 2.4 and of course first I want to have a full backup, so I started to do so with Titan backup 7.2.1.2 which failed.
I did: Titan backup => Batch actions => Backup all user apps + system data [Run] => clicked on green check on right top corner => Popup to show that backup starts opend for a second and then closed without any comment.

For sure I did not only tried "Backup all user apps + system data", I tried the other backup options too, but each failed in the same way.

I´ve saw a message Titanium Backup Pro: Batch backup interrupted: Insuficient free..

Can´t reed more ;-(

Internal storage: Available 9,24 GB
External SD Card: Available 25,11 GB

Any idea what is the problem? With old 2.2 international backup works well on the same device.

Thank you for any help!