You could probably use the post_init signal to make a copy of the
model values for comparison in your save method. I'm doing something
similar to create a special manager object each time a certain model
instance is created.
Something like this...
def backup_model_data(sender, instance, signal, *args, **kwargs):
instance._original_data = instance.__dict__.copy()
class YourModel(model.Models):
...
dispatcher.connect(backup_model_data,signal=signals.post_init,
sender=YourModel)
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