Multipage - Save to session on back button?

Hello everyone.
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I set up a multipage form.

I'd like to save the data they enter on step 2 when they click the back button to step 1. So it will still be there when they go forward and come to step 2 again.
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Has anyone done that yet? if so how did you do it?
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The back buttons work I just don't know how to save it to the session.
Maybe with a submit and redirect?
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Any help appreciated :-)
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Greetings
morphz

Can't edit at the moment. That's my form:
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http://farb-formulare.jdevcloud.com/formulare/auftragserfassung-reinigung

Hi morphz,
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You can do this with a second Submit button. After the form submits you need to process it as normal including the data save - then check to see which Submit button was clicked and redirect to the matching page.
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Bob

Thanks for the reply Bob
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I am a bit confused.
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#1. The submit buttons load the event I declare in the display section. Correct?
#2. As far I understand I add just one more event as target of all display sections where all the buttons and their matching redirectings are saved. Correct?
#3. What elements do I need to use in this event? How can I determine which submit button was clicked? php? or is there an easier way.
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Thanks in advance!

Hi morphz,
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1. Yes
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2. I don't think so but I'm not sure what you are saying.
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3. You can tell which button is clicked by checking the value which is submitted by the button element.
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Bob

I am not familiar with php. can you help me with the code?
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Or am I approaching this wrong..
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Thanks!
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<?php
 $value1 = $_POST["button19"];
 $value2 = $_POST["button141"];
  
 if ($value1 or $value2 == "Personalien") {
 header("Location: http://example.com/Page1.php");
 }
 if ($value1 or $value2 == "Adressen") {
 header("Location: http://example.com/Page3.php");
 }
?>