An online system is not the system to restore first. An online system would not be usable if it were restored first.
A batch system is not a system to be restored at all. The term "batch system" describes a type of transaction processing system. In a batch system, transactions of a similar type (i.e., accounts receivable receipts) are accumulated over a period of time such as a day, and then the whole batch is processed to update the master files.
A decision support system is not the system to restore first. A decision support system would not be usable if it were restored first.
The operating system should be restored first, because without the operating system, none of the other applications can be run. The operating system serves the following functions: It provides the user interface that allows the user to communicate with the computer in order to load programs, access files, and accomplish other tasks. It provides resource management to manage the hardware and networking resources of the system. It contains file management programs that control the creation, deletion and access of files and also keep track of the physical locations of files on secondary storage devices. It includes task management programs to manage the accomplishment of the computing tasks. This enables multitasking capability, so that several computing tasks, for example keyboarding and printing, can take place at the same time. It provides utilities and support service to perform housekeeping tasks and file conversion functions such as data backup, data recovery, virus protection, data compression and file defragmentation.
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