Subversion is still the gold standard for version control (a.k.a. source control) systems, but the new kid on the block - Git - has undeniable advantages for many development models. Even for solo or centralised hierarchical development organisations, Git's agile branching and merging make it a joy to use.
But if you're going to go to the effort of switching version control systems, you probably also want to consider moving your repository to the cloud. This increases your options for off-site developers, and reduces the risks and maintenance costs of internally managed version control servers.
This article describes how to migrate a Subversion repository to Bitbucket, one of several online repositories.