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International Society of Science and Applied Technologies |
| Optimal Backup Policy for Systems Against Cyber Threats and Physical Failures | ||||
| Author |
Kenichiro Naruse
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| Co-Author(s) |
Toshio Nakagawa
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| Abstract | Modern computer systems must defend against both hardware
failures and silent cyber threats like ransomware. A
major challenge is the ”infection period,” where malware
stays hidden and infected backups before being detected.
This paper proposes an optimal backup policy that combines
frequent ”normal backups” for hardware recovery
with ”immutable backups” for data security. We develop
a mathematical model to find the best backup timing by
analyzing the physical failure rate, infection rate, detection
delay, and backups unreadable rate. The goal is to
optimize the number of normal backups n and the interval
to minimize total operational costs. This paper shows
that the best strategy shifts based on risk. When hardware failure rate is low or backups unreadable rate is high, the system remains simple (n = 1) to avoid using corrupted data. As hardware risks increase, the system adds more layers (n ≥ 2) to ensure reliability. This provides a clear quantitative guide for administrators, replacing guesswork with a strategy that adapts to real-world threats.
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| Keywords | Backup Policy, Resist Malware, Cyber Threats, Physical Failures, Immutable Backup | |||
| Article #: RQD2026-207 | ||||
Proceedings of 31st ISSAT International Conference on Reliability & Quality in Design |