Durability

Mirror image backups (also referred to as bitstream backups) involve the backup of all areas of a computer hard disk drive or another type of storage media (e. g. , Zip disks, floppy disks, Jazz disks, etc. ). Such mirror image backups exactly replicate all sectors on a given storage device. Thus, all files and ambient data storage areas are copied. Such backups are sometimes referred to as “evidencegrade” backups and they differ substantially from standard file backups and network server backups. The making of a mirror image backup is simple in theory, but the accuracy of the backup must meet evidence standards. Accuracy is essential and to guarantee accuracy, mirror image backup programs typically rely on mathematical CRC computations in the validation process. These mathematical validation processes compare the original source data with the restored data. When computer evidence is involved, accuracy is extremely important, and the making of a mirror image backup is typically described as the preservation of the “electronic crime scene. ”
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Logical coherency among all integrated parts; also, adherence to a given set of instructions or rules. One of the four required characteristics of all database transactions (the other three are atomicity, isolation, and durability). All transactions must begin operating in an environment that is consistent with all of the database’s rules.
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The letters in ACID represent the four required characteristics of database transactions: atomicity, consistency, isolation, and durability.
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One of the four required characteristics of all database transactions. A database transaction must be an “all-or-nothing” affair. If any part of the transaction fails, the entire transaction must be rolled back as if it never occurred. The assurance that an operation either changes the state of all participating objects consistent with the semantics of the operation or changes none at all.
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A backup that stores only those files that have been modified since the time of the most recent full or incremental backup. This is also used to mean the process of creating such a backup.
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