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David Steele
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Resume does not work correctly with delta diff/incr backups because the presence of a reference causes it to remove the file with the idea that it can just be referenced again. This is true for timestamp-based backups but for deltas all existing files need to be rechecked (which requires a reference). This is fixable but not without significant effort and new tests and it calls into question the usefulness of non-full resumes. For diff/incr, if the file was changed since the prior backup there is a good chance it will be modified again before the resume occurs. In order to keep this feature as useful as possible for the most valuable case, limit resumes to full backups.