Removing \\\ from Saved Data

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You can change the " signs to " automatically using PHP’s htmlspecialchars() prior to your update_option() call: 

$post_client_template = htmlspecialchars( $post_client_template );
update_option( 'contact_record_client_template', $post_client_template);

If you need to change ' characters as well, use this:

$post_client_template = htmlspecialchars( $post_client_template, ENT_QUOTES );
update_option( 'contact_record_client_template', $post_client_template);