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One of three System Fault Tolerance (SFT) levels. SFT protects data by providing procedures that allow a network server to automatically recover from hardware failures. SFT protects data by providing data duplication on multiple storage devices; if one storage device fails, the data is available from another device. There are three levels of SFT: Hot Fix, disk mirroring or duplexing, and server mirroring. Each level of redundancy (duplication) decreases the possibility of data loss.