Solution : https://service.sap.com/sap/support/notes/554629 (SAP Service marketplace login required)
Key words :
transaction sara -> 'archiving object-specific customizing' -> 'server selectn', object-independent background server groups, archiving object-specific customizing, storing/retrieving individual files, jobs called arv sto, generating larger archive filesthe, job log internal error, entire data archiving reduces, select individual archive files, object-specific customizing
Related Notes :
395766 | Storage of archive files as of SAP Basis Release 4.6C |