I was just wondering if I'm on mobile and a new update comes out for mobile will I keep all of my progress or will I have to restart?

Normally you can download the new apk file and install it to update your existing files and continue your saves in the new version.

i dont advice to install new update without deleting the old game file it will cause huge lag and slow down in game i advice everyone to backup your save file

there is an app called helium  you download it in google playstore for your mobile

you also need download helium on your PC from here

https://github.com/koush/support-wiki/wiki/Helium-Desktop-Installer-and-Android-...

make sure you enable USB debug for your mobile to enable it

Enabling USB Debugging on an Android Device

1. On the device, go to Settings > About <device>.
2. Tap the Build number seven times to make Settings > Developer options available.
3. Then enable the USB Debugging option. Tip: You might also want to enable the Stay awake option, to prevent your Android device from sleeping while plugged into the USB port.

after you do all that then follow the steps bellow

here is what you do now to back up your game save file

connect your mobile to your pc by using a USB

open helium on your pc then open helium on your mobile

it will enable the helium on your mobile to work

now you can remove the USB helium should work on your mobile now

click back up and click on the game and click back up

chose to save in internal storage for free or you can save to google cloud save if you want but you need need to make 1 time payment for this then you can always save to cloud forever

you can delete your game now and install new version and use save recovery from helium