Data Backup on remote site

Dear Team, We are using Symantec Backup Exec 12 in our  head office and doing the backup/recovery for all of our applications. We having multiple remote sites which are connected through MPLS and there file servers located on each sites, currently there is no backup plan on those servers. We need to do the backup for those file servers with out affecting the MPLS connection. Is there anyway we can obtain this, Management server is located in HO.