CRC mode: compare file attributes and CRC for every file, and checks previously stored CRCs to detect corruption.Attribute+ mode: compare file attributes and calculate CRCs only for new and changed files for future verification.Attribute mode: compare file attributes (size and last modified time).Compare modes (how to detect which files have changed).None mode: don't copy either, differing files will only be logged for manual intervention.Newer mode: copy newer files based on last modified time.
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