If you would like to remove your back-up from the cloud for privacy concerns, or just want to start a fresh cloud backup, please carefully follow the below steps:
Login to your icloud or google drive.
Look for the Bitcoin.com Wallet folder
Inside that folder, find the wallet.data file and delete it.
Before doing this, please be absolutely certain that you have your 12 word recovery phrase written down, as this is the only possible way to regain access to that wallet should anything happen to it or the device it is stored on.
To find your 12 word recovery phrases, please see the following article:https://support.bitcoin.com/en/articles/3542815-backing-up-my-wallet