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Time Synchronization: Ensure that the production server and the standby server have the same synchronized time source so that the time stamps on backed up files reflect reality.
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Redundant Hardware: Make sure that there is adequate hardware which is able to take the load of the production system usage in the event of total hardware failure.
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Software Security: If a system is compromised by malware, this might corrupt backups. Ensure best practice server security is observed on your production and standby systems.