Choosing Backup host for Backup media server selection

Here is my enviorment 

Mulitple Unix media servers with storage units

3 Backup hosts 2 one datacenter and 1 in the other datacenter

for example the backup hosts are

DC1-backuphost1

DC1-backuphost2

DC2-backuphost1

For DC1 the backup hosts in that DC backs up to media servers in that DC 

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