Hello there, Jdiaz1.
QuickBooks Online automatically backs up your data. You don't have to save it on a folder or flash drive. Having said that, your client's data is saved in a cloud. You don't have to restore the data.
However, if transactions are deleted, you'll have to recreate them again. QuickBooks is unable to restore any deleted information or transaction.
Let me know if you have other questions. We're just around to help you.