Comment by igouy

And in practice, both.

Save image... for short-term convenience; build clean every week from archived text files.

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1984 "Smalltalk-80 The Interactive Programming Environment" page 500

"At the outset of a project involving two or more programmers: Do assign a member of the team to be the version manager. … The responsibilities of the version manager consist of collecting and cataloging code files submitted by all members of the team, periodically building a new system image incorporating all submitted code files, and releasing the image for use by the team. The version manager stores the current release and all code files for that release in a central place, allowing team members read access, and disallowing write access for anyone except the version manager."

https://rmod-files.lille.inria.fr/FreeBooks/TheInteractivePr...