Computer data storage is a technology consisting of computer components and recording media that are used to retain digital data.It is a core function and fundamental component of computers.: 15–16 The central processing unit (CPU) of a computer is what manipulates data by performing computations. In practice, almost all computers use a storage hierarchy,: 468–473 …

Rationale. A full backup of a large data set may take a long time to complete. On multi-tasking or multi-user systems, there may be writes to that data while it is being backed up.This prevents the backup from being atomic and introduces a version skew that may result in data corruption.For example, if a user moves a file into a directory that has already been backed up, then that file …