As new objects are added to the repository, the files grow in size. Eventually, the files take up a lot of space due to old objects that are no longer referenced (garbage). To clean these out, see the MagmaCompressor class.
A Repository Browser
There is a package on SqueakMap called "Magma Buffer Browser" that uses Maui to render the shape of the physical object-model directly from the buffers, without ever instantiating any instances of the actual domain classes.
It also presents meta-information from the commit-log record of each object, if available.
Just for interest, the following is a screenshot from an early version of Maui (circa 2004).
