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Changes to existing files are handled by keeping the old
version and creating a new version.
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Only after the new version is safely stored the previous one
can be deleted.
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Versions are characterized by an increasing version number.
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Whenever possible, different versions of the same file stripes
are stored in the same server.
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If a newer version is stored on a different server, an appropriate
consistency protocol is run in order to kill obsolete versions
using the DELETE HTTP method.
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