Final answer:
Most common data backup schemes combine full backups with incremental or differential backups and often adhere to the 3-2-1 backup rule.
Step-by-step explanation:
Most common data backup schemes involve a combination of full backups and incremental or differential backups. A full backup copies all selected data, but due to its size and time consumption, it's typically not performed as often as other types. To complement this, incremental backups save changes made since the last backup, requiring less storage space and time, making them more efficient. Differential backups, on the other hand, save changes made since the last full backup, which require more space than incremental backups but less than conducting full backups more frequently. It's recommended to follow the 3-2-1 backup rule: keep at least three copies of your data, on two different storage types, with one of them located offsite.