> The easiest way to save chunks of connected data is probably using
> ImageSegments.

Not necessarily (I'm just waking up). You can use the SmartRefStream
perhaps a bit easier.

http://minnow.cc.gatech.edu/squeak/2318

For instance, here's how VMMaker saves its config data:

saveConfigurationTo: aFile
	"write info about the current configuration to a file."
	| fileStream |
	fileStream _ FileStream newFileNamed: aFile.
	fileStream fileOutClass: nil andObject: self configurationInfo

and how it reads the data back:

readConfigurationFrom: aFileName
	"read info about the current configuration from a file. Return the
array that would have been made by #configurationInfo"
	|  fileStream |

	fileStream _ FileStream oldFileNamed: aFileName.
	^fileStream fileInObjectAndCode