You can download your entire Snapchat data file with a few clicks.
Open your Snapchat app.
Tap your bitmoji (upper left corner of screen)
Tap Settings (gear icon – upper right corner of screen).
Scroll down and tap My Data.
Log in to Snapchat with your Username and Password.
Scroll down and tap Submit Request.
You’ll receive a confirmation message.
When your data file is ready, you’ll get an email from Snapchat with instructions on how to download the .zip file. In that file, you’ll find all the information the app has stored about you.
You can read more about Snapchat privacy here.