help lost app when my hdd failed

Hi all im new so not sure if this is in the write place. i was developing an app last year when my hard drive failed, i lost everything, i have just logged onto expo to start again, and when i open the app on my phone the app has come up again and i can move around thencreens, could anyone tell me if the files are saved somewhere on expo or on my phone so i can retreive them.
thanks andrew