Solution : https://service.sap.com/sap/support/notes/1231097 (SAP Service marketplace login required)
Key words : 
/instguides-> sap netweaver 2004s-> release 2004s-> maintenance-> sps <current_sp_number>-> netweaver 2004s support package stack guide - sps<current_sp_number> update procedure 1, support packages stack guide, support package, existing trex/bia instance, revision huge performance improvement, bia backup&recovery scenario, filled bia indexes anymore, mf download procedure, sap note 1002839, update procedure
Related Notes : 
       
| 1308274 | BWA 7.00: High memory if fems compression is used | 
| 1283363 | BIA Revision 48: AlertServer corrections and hints | 
| 1260994 | BIA 7.00: Additional consistency check for index binaries | 
| 1246252 | BIA/TREX alertserver: Check "cpu_usage" Seems Incorrect | 
| 1242972 | BIA Revision 47: AlertServer corrections and hints | 
| 1232308 | BIA 7.00: Backup blade not used for all indexes | 
| 1118425 | BIA 7.00: Activate performance feature FEMS compression | 
| 1058533 | TREX/BWA/HANA service connection to customer systems | 
| 1002839 | BIA 7.00: Error due to huge resultset of query | 
| 992064 | BIA 7.00 + BIA 7.20: BIA system check | 
| 883726 | BIA 7.00: Central Note SAP NetWeaver BI accelerator |