Why is temporary or 'scratch' space necessary?
Impression creates temporary, freshly-formatted HFS+ sparse images in order to build the initial archive. This is necessary as to provide a stable, 100% clean repository for the files to be written to as the archive is built. After the initial archive has been created, this temporary sparse image is then either used as a basis to manufacture a CD/DVD or it is converted to .dmg format and saved to a locally-mounted drive as chosen by the operator. The use of a temporary sparse image guarantees a formatted HFS+ file system that Impression can trust to preserve all file attributes during the archiving process (both data- and resource-fork are archived), something which is quite important in guaranteeing the validity of data archived during backup processes.
ImpsAnswer 104, last modified: 2006.02.06
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