If one copy of all of your data is deleted, you should be able to recover it.
Maintain three copies of your data: This includes the original data and at least two copies.
Use two different types of media for storage: Store your data on two distinct forms of media to enhance redundancy.
Keep at least one copy off-site: To ensure data safety, have one backup copy stored in an off-site location, separate from your primary data and on-site backups.
Someone that was following best practices would have regularly made a copy of their data and stored it somewhere that doesn’t depend on anything Oracle does, since I’d consider depending on Oracle to store all of your data to be storing all your data at one site.
If one copy of all of your data is deleted, you should be able to recover it.
https://www.veeam.com/blog/321-backup-rule.html
Someone that was following best practices would have regularly made a copy of their data and stored it somewhere that doesn’t depend on anything Oracle does, since I’d consider depending on Oracle to store all of your data to be storing all your data at one site.
This guy Backups