"Database administrators specialize in ensuring the safety of the client's data. Candidates should be well-versed in database design, security, and backup. Expect a technical-based interview that will test your ability to restore or find a file, manage databases, and increase the efficiency of a backup. Excellent organizational and communication skills will show that you are the right fit for maintaining the company's database."
Explain way to improve their current 15 hours database backup.
rman incremental backup