This document discusses Atlassian's Data Center and Cloud options. It provides details on when each option is best, their key advantages, differences in pricing, security, scalability and more. A Data Center allows hosting products on your own infrastructure but requires more maintenance, while Cloud provides an always-on service with less overhead. Migrating from Cloud to Data Center is easier than the reverse, as some customizations and add-ons may not be compatible moving to Cloud. The document aims to help users determine the best Atlassian solution for their needs and capabilities.