51 lines
2.6 KiB
XML
51 lines
2.6 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
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<pkgmetadata>
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<maintainer type="person">
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<email>polynomial-c@gentoo.org</email>
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<name>Lars Wendler</name>
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</maintainer>
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<maintainer type="person">
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<email>mgorny@gentoo.org</email>
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<name>Michał Górny</name>
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</maintainer>
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<longdescription lang="en">
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Lziprecover is a data recovery tool and decompressor for files in the lzip
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compressed data format (.lz), able to repair slightly damaged files,
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recover badly damaged files from two or more copies, extract data from
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damaged files, decompress files and test integrity of files.
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The lzip file format is designed for long-term data archiving. It is clean,
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provides very safe 4 factor integrity checking, and is backed by the
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recovery capabilities of lziprecover.
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Lziprecover is able to recover or decompress files produced by any of the
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compressors in the lzip family; lzip, plzip, minilzip/lzlib, clzip and
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pdlzip.
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Lziprecover makes lzip files resistant to bit-flip (one of the most common
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forms of data corruption), and can safely merge multiple damaged backup
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copies.
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If the cause of file corruption is damaged media, the combination GNU
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ddrescue + lziprecover is the best option for recovering data from multiple
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damaged copies.
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If a file is too damaged for lziprecover to repair it, all the recoverable
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data in all members of the file can be extracted with the '-D' option.
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Lziprecover is able to efficiently extract a range of bytes from a
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multi-member file, because it only decompresses the members containing the
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desired data.
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Lziprecover can print correct total file sizes and ratios even for
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multi-member files.
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When recovering data, lziprecover takes as arguments the names of the
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damaged files and writes zero or more recovered files depending on the
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operation selected and whether the recovery succeeded or not. The damaged
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files themselves are never modified.
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When decompressing or testing file integrity, lziprecover behaves like lzip
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or lunzip.
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To give you an idea of its possibilities, when merging two copies, each of
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them with one damaged area affecting 1 percent of the copy, the probability
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of obtaining a correct file is about 98 percent. With three such copies the
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probability rises to 99.97 percent. For large files (a few MB) with small
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errors (one sector damaged per copy), the probability approaches 100 percent
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even with only two copies.
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Lziprecover is not a replacement for regular backups, but a last line of
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defense for the case where the backups are also damaged.
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</longdescription>
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</pkgmetadata>
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