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"Saving" a file is keeping it locally for an undetermined time as it was last saved.
"Preserving" a file is converting a file into an ideal preservation format, verifying its integrity, and storing it in multiple locations with low-access and high-security measures in place to ensure continued access.
Advantages of Digital Preservation
Access to digitized and born-digital objects is technology-dependent
Technologies can fail or become obsolete
Less accessibility helps increase the odds of maintaining integrity
Preservation is the solution to increasing the ability to access material in the future
"Digital preservation is the series of managed activities necessary to ensure continued access to digital materials for as long as necessary. Digital preservation is defined very broadly [...] and refers to all of the actions required to maintain access to digital materials beyond the limits of media failure or technological and organizational change."