The Backoffice is organizing the legal transfer of funds (money) in return with the legal transfer of ownership.

The Backoffice is sending trade confirmations of executions from the Front Office.

The Backoffice takes over the function of a Central Counterparty (CCP).

The Backoffice is maintaining connections with Custodians, and Regulators. 

The Backoffice is receiving trade confirmations of executions from the Front Office.

The Backoffice sends order instructions back to Investors, to signal trading opportunities.

The Backoffice is dealing with all pre-trade operations.