All versions in Altostra are saved in a bucket owned by the customer - that is the version repository. Altostra does not directly store your projects, source code or build artifacts.
The first cloud services account you connect in Altostra, will be the default account and will host your version repository.
Every time you use the push command, a new version is created and uploaded to the version repository. When you deploy a project, the version name you provide during the deployment is used to fetch that version from the repository and deploy it to your account.