-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 El 2014-08-06 a las 13:09 +0200, jcsl escribió:
Hi.
I want to make backup a partition and I want to compress the data. I'm worried about the possibility of the compressed files being damaged when I try to restore then. I've read that in compressed tarball you cannot recover any data after a single damaged bit.
Correct.
I'm looking for tools like rar that creates extra recovery files. What options are available?
Me too. Rar is the only one I know, but I'm unsure it supports all Linux file attributes and permissions, symlinks, hardlinks, etc. And of course, it is payware.
What I've found at
https://en.wikipedia.org/wiki/Comparison_of_archive_formats#Comparison
and available in the repositories are DAR and rar. Lzip also has a recovery utility called Lziprecover. Parchive is another related utility:
Parchive, if it is what I'm thinking of, is far from easy to use. It is not transparent. I have seen some compression tools with promise, but I have not tested them, or are listed as beta :-(
behave in case of file damage. I have used dd + tar.gz previously to make backups but I'm not sure if it is a good option anymore. Any hints?
In the event of media damage, or simple data corruption, badly, or not at all. You need to make two or three copies, and/or use external utilities (like par) to create external recovery files. With unsure results if it is the media itself what is damaged. I have not ever seen a Linux backup utility that implements both compression and forward data recovery methods - such as used, for example, by pctools backup, back in the 80's, with good results. - -- Cheers Carlos E. R. (from 13.1 x86_64 "Bottle" (Minas Tirith)) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iF4EAREIAAYFAlPiNnwACgkQja8UbcUWM1y/IQD/UR9qQJgWRjBZ4kWnrAQUV2Mr iR3OlY6C4JlI9+9Rf34A/jGiJkD+0wzE44zXE6v5oCz1DTBnMq8H2j56FKNZqqDh =xz/F -----END PGP SIGNATURE-----