Jisc asked Mimas how long it would take to migrate their national services to the cloud. Mimas had around 80 nodes with 120TB of storage across 10 production services and projects. They evaluated options like using Jisc's cloud once it was built, building their own cloud using Janet frameworks, or using commodity clouds. Mimas opted for commodity clouds like AWS and Azure due to cost, connectivity, and familiarity. They began migrating services like HistoricalTexts, Jorum, Jusp, Census, and Archives Hub to AWS, using services like EC2, EBS, and S3. Mimas estimated they could save around £400k per year by migrating to the cloud compared to maintaining their own infrastructure.