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add data verification changelog entry
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changelog/unreleased/issue-4529
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Enhancement: Verify data integrity before upload
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Hardware issues or a bug in restic could cause restic to create corrupted files
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that were then uploaded to the repository. Detecting such corruption usually
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required explicitly running the `check --read-data` command.
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To prevent the upload of corrupted data to the repository, restic now
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additionally verifies that files can be decoded and contain the correct data
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beforehand. This increases the CPU usage during backups. If absolutely
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necessary, you can disable the verification using the option
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`--no-verify-pack`.
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https://github.com/restic/restic/issues/4529
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https://github.com/restic/restic/pull/4681
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