Java algorithm question.

Hi, I'm java developer with 3 years experience. I looked and learned the specification of the task you gave in 2 screenshots and already found a solution to implement. Approximate time for me to complete project - 1-2 hours. The only "decorative" question I have is how to name class that will implement BackupService? (By default BackupSeviceImpl). Feel free to contact me. Thanks.

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