Continuing our series on backup and storage, from getcirq.com, now we shall acquaint with warm backups. Warm backup is a method to create redundancy in data by having one identical system to run in the background of the main system that is live and is called the primary server. The data is regularly copied to the secondary server.
It is important to note that the warm server is interfaced periodically to the primary server to receive updates but doesn’t run simultaneously. This means some of the time, the primary and secondary systems can contain different data or different data versions. But both the systems are having identical data when they are mirrored in real time.
In contrast, as we earlier read, a cold standby system is a backup method that uses an offline backup for another primary system. The back-up is taken at long intervals usually end of the day or even months as in personal use cases.
A warm server is booted to sync updates with the primary server, which in turn was used to backit is backed up. This is done periodically and is mostly used used to replicate and mirror. It is brought into action when primary server crashes or is destroyed, such as in a natural disaster.
Sometimes, a warm server can require an upgrade before they can be used in disaster recovery. An implementation of warm server can cost in between that of the time and resources associated with cold and hot servers. In fact, a few companies such as Microsoft, provide free software licenses for cold backup. But one needs to purchase license for warm and hot serverse.
Between hot and cold
A warm site is a compromise between a hot and a cold site. These will have hardware and connectivity already established. This is yet not at as great a scale as hot backup. This is very popular as it is not resource intensive. Also, the cost of setup and license is less than that of hot-backup systems. Hence it is popular choice among all setups in IT and cloud based systems. The recovery can see delays while backup hardware are delivered to the warm site, or internet network is established and data recovered from a remote backup site.
Yet better is a cloud based pos. In such a system, like in the case of CirQ Point of Sale, the data is in cloud with a reputed cloud-service provider. The service providers are generally IT giants like Amazon, Microsoft, Google, etc. It can’t be said if the data is real-time or periodic. Not just the backup isn’t present, the data too isn’t. Furthermore, it depends on the service provider on how they do it.