I have an application whose data model is an NSMutableArray with
elements that could be pointers other NSMutableArrays, much like what
you would navigate with a NSIndexPath. I am using NSKeyedArchiver to
archive the data model to a file. Right now I archive the entire top
level array object (and therefore all its parts) to the file using
archiveRootObject:toFile.
Is it possible to archive only the portion of the data model that
changed rather than the entire thing every time? I need the entire
data model to be archived so that it can be reloaded when the
application starts but for performance reasons I am interested in
seeing if it's possible upon a change to the data to only re-archive
the small part that changed.
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