Because an application under development is subject to widespread change, the entire application should be saved regularly. If a catastrophic failure occurs, not more than one day’s development work should be lost. Backing development objects prevents loss of work through hardware failure and provides a measure of security against human error; for instance, the inadvertent deletion of source, objects or data.
Backing up programming changes should be done daily. This will normally involve saving the development library or libraries.
Ancillary libraries, for example, test data or development tools, may only require an occasional backup.
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