Acces to archive file after consolidation system SAP

He experts,

My customer have 4 systems 46C. this 4 systems manage the maitenance for 4 regions. From each system, we archive data with SARA transaction. The archive file are stored on filesystem.

Now, the customer want to manage the maintenance on ONE system ERP ECC6 for all regions.

The target system is obtained by :

- migration of system (A) from 46C to ECC6 using the SAP migration tools

- for systems (B, C, D), we procede by data migration from 46C system to new system ECC6

My question is about the migration of the archivefile generated by 46C for each system and how these data will be accessible by the neuw system ECC6

Thank you for your help

Mohamed