Telecoms giant BT is set to provide data centre services to the Department of Finance and Personnel under a £15m contract.
The facilities will house IT services for both the Northern Ireland Civil Service and the wider public sector.
BT will manage the two centres' operations, while the public sector will continue to manage the IT systems within them.
The contract, which is valued at £15m over 10 years, was secured following a tender process.
Finance Minister Arlene Foster said the new data centres, which will be up and running in autumn next year, would bring a "much more efficient IT system for the public sector".
Peter Russell, general manager of BT Business in Northern Ireland, added: "To have been trusted by the department to host all of their data for the next 10-16 years is a true testament to our local team's professionalism and capability."
Mr Russell also told how BT would be investing more than £4m in the next few months to ensure that the new facility will be in place.