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