The new centre, based at Sirius House, South Gyle, will offer managed workspace for up to 250 people in the event of firms needing to relocate due to a disaster.
It will link up with Onyx's Glasgow-based workplace recovery and data centre and become the new base for staff at the group's Dalkeith and Falkirk offices.
CEO Neil Stephenson said businesses were coming under increasing regulatory pressure to protect their assets.
"While more serious threats to a business such as terrorism are rare, power outages, fires or even denial of access to office facilities can cause irreparable damage," he said.
The facility builds on Onyx's growing presence in Scotland following acquisitions of Falkirk and Glasgow-based Campbell Lee and Dundas IT in Edinburgh last year.
The group has targeted expansion in Scotland, with nearly half of its 100-strong team based in the former Glasgow, Dalkeith and Falkirk offices.
It has also secured a string of overseas orders including work from Dubai World, the owner of P& O Ferries and Legoland..
EMERGENCY HELP: Onyx Group Chief Executive Officer Neil Stephenson