A cold backup is a method of creating a secondary copy of data that is not accessible during the backup process. It is the opposite of a hot backup, which allows users to access data during the backup. Cold backups can be scheduled or performed on demand, but interrupting the process can result in data loss or system freeze.
Also known as an offline backup, a cold backup is a method of creating a secondary copy of the data contained in a given database or computer system. This strategy differs from other backup jobs in that the system and data are not accessible while the backup is in progress. Once the cold backup is complete, end users can log back into the system and access the data at will.
Cold backup is the opposite of what is known as a hot backup. With a hot backup, the system keeps running and users can freely access the data during the backup process. With many systems, users are likely to experience at least an additional delay in retrieving information because some system resources are in use with the backup process. With a hot backup, extra care must be taken to capture any changes or additions that users enter during the backup process. Businesses that are open around the clock often prefer to go with the hot backup strategy.
For companies that prefer to use a cold backup job, the task typically takes place at the end of the working day. Businesses that operate around the clock can choose to schedule backup for the early hours of the morning, when users are least likely to request system access. This approach helps minimize the possibility that the backup prevents employees from assisting customers during the copy.
A cold backup can be performed using a preset schedule that identifies the specific time for the backup to start automatically. For example, the backup can be configured to start at 2:00am each morning, providing time to complete the action before employees start arriving for the start of the workday. You can also perform a cold backup on demand. This approach is often useful when you need to refrain from initiating backup until specific tasks, such as updating data in a billing system, are completed for the workday.
Attempting to access a computer system while a cold backup is in progress can produce several results, depending on how the system is configured. In some cases, the system will simply not allow the login attempt to complete. Other systems may allow the login to override the backup process, effectively aborting the backup. Generally, it is not recommended to interrupt a cold backup in progress, as this may result in data loss, even system freeze or hang for a short time.
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