$model->data state in ModelBehavior ::beforeSave() and ::afterSave()

I am writing a behavior which checks a field for duplicates in beforeSave() and updates the created row in afterSave().

I am wondering what happens to $model->data array if I modify it directly or I use $model->find() or $model->save() while in the callback.

Do other behaviors and callbacks also receive the same data array?
Am I responsible to leave it as-is after I finish modifying the data? 

Do I have to make another instance of the model and do finds and saves with that instance?

<?php 

function beforeSave(Model $model){

$value = $model->data[$model->alias]['unique_field'];

$duplicates = $model->find('all', array(

'conditions' => array('unique_field', $value)

));

if ($duplicates) { /* ... */ }

//what happens to $model->data here?

}

function afterSave(Model $model, $created){

$value = $model->data[$model->alias]['unique_field'];

$model->data[$model->alias]['unique_field'] = strrev($value); //for demonstration purposes

$model->save($model->data, array('callbacks'=>false));

//what happens to $model->data here?

}

Thanks for the input!

P.S. I have to update in afterSave because the unique field depends on the id, and has a temp value before the id is available.

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