The system of data collection, processing and protection is considered. In such system data is transmitted via data channels from the data collection and processing blocks to the data protection block. The received data arrays are stored in the data protection block. The functioning termination one of the data collection blocks may lead to the loss of the received data. The problem of ensuring the stable functioning of the system for collecting, processing and protecting data is formalized and studied in this paper. It is also considered the case when the system has a data backup block. An illustrative numerical example is solved.