When you create a wallet, a seed or security phrase is generated, formed by 12/24 words (Seed). You must save the 12/24 words in the same order they were shown to you in a very safe place and DO NOT SHARE them with anyone.
If you lose your phone or it breaks down, thanks to this seed you can restore or regenerate your wallet, from the Settings section of the Bitnovo app, and that way you will be able to access with all permissions to your balance and history.
Don't forget that every time you create a new Wallet a new seed will be generated and, therefore, the 12/24 words will be different. Generating a new Wallet deletes all previous existing records.
Note: Bitnovo is NOT the custodian of your wallet, only you are the owner. Bitnovo also does not have access to your seed and does not know it. Also, don't forget that the security PIN that is created with the Bitnovo app is not used to backup or restore the wallet, it only has a privacy function to allow access to the app on the cell phone on which it is installed.