The role of the Backoffice is to organize Clearing and Settlement.

The Backoffice is providing failback operations, when trading operations fail (Back is for Backup)

The Backoffice is processing transactions. 

The Backoffice is part of the Risk Management of a banking institution.

The Backoffice is a management layer in banking operations, which deals with transactions.

The Backoffice is responsible for trading operations.

The Backoffice is term to describe a number of departments which provide support for trading operations.

The Backoffice is organizing pre-trade check before execution.