Solution : https://service.sap.com/sap/support/notes/975965 (SAP Service marketplace login required)
Key words : 
standard backup directory            /usr/sap/<sid>/trx<instance_number>/backup/index, standard backup directory/usr/sap/<sid>/trx<instance_number>/backup/index, /usr/sap/<sid>/trx<instance_number>/exe/python_support, /usr/sap/<sid>/trx_<instance_number>/exe/python_support 2, source /usr/sap/<sid> /trx<instance_number>/trexsettings, week            exportpath=/usr/sap/%sid/trx00/backup/%, /usr/sap/<sid>/trx<instance_number>/trexsettings, /usr/sap/<sid>/trx<instance_number>/index, --exportpath=/usr/sap/%sid/trx00/backup/%, --importpath=/usr/sap/<sid> /trx00/backup/%
Related Notes : 
       
| 883726 | BIA 7.00: Central Note SAP NetWeaver BI accelerator | 
| 808768 | External tools causing corrupt files | 
| 802987 | TREX 7.0: Central Note |