zpaq Reviews and details

Social recommendations and mentions

• Debian on xz-utils: revert to version that does not contain changes by bad actor

  I will assume that the average effective broadband connection is about 20 MB/s, and both xz and zstd decompressions are faster than the download under this assumption. But there are lesser known compression algorithms that are more efficient in terms of compression ratio for this target decompression speed, like zpaq [1], which are rarely considered as alternatives. So multiple factors exist here and I believe... - Source: Hacker News / about 1 month ago

• External Drive won’t open on mac (unique case)

  My best bet is some data corrupted when plugging into windows. If it still works in windows I strongly recommend you backup important data on your drive. You can use 7z to compress, or zpaq which can achieve incredible compression rate in some cases. Source: 11 months ago

• PeaZip 9.0.0 released

  Yes, you can find more information on how it works on the zpaq's author website http://mattmahoney.net/dc/zpaq.html. Source: over 1 year ago

• QOI + ZPAQ: a possible combo to streamline game asset deployment

  There was a recent essay about the use of the QOI format for software/game assets. They're somewhat bigger than PNGs; however, I discovered that they compress really good with ZPAQ. Source: over 1 year ago

• WinRar vs 7-Zip which one is better (excluding trial/pricing of Winrar)

  But when you need high compression rates, why not use something more innovative? ZPAQ is amazing - Journaling archiver for incremental backups There are plugins for total commander to ease managing, or gui linked at Matt Mahoney's page It offers better compression ratio than both Winrar and 7-Zip, for even more RAM and time to compress. The amazing part is not wasting energy and storage space for the same... Source: over 1 year ago

• Which compression algorithm/file type for backups?

  ZPAQ1 is great, it supports incremental backups and compression algorithm is really good even on already compressed data like images. Zpaqfranz2 is a fork that adds more advanced checksumming algorithms. It's also worth looking into. Source: over 1 year ago

• Xz format considered inadequate for long-term archiving

  I'd recommend checking out zpaq[1], it purposed for backups, and has great compression (even on low setting) for large 100GB+ file collections. However for smaller stuff I use zstd at level 22 in a tar for most things since it's much faster, though a little heavier. [1] http://mattmahoney.net/dc/zpaq.html. - Source: Hacker News / almost 2 years ago

• Anyone know to run zpaq files. Peazip and ark don’t work

  Ya probably grab the program they're named after. Source: almost 2 years ago

• Which compression method for archiving OS ISOs?

  For this task it sounds like at least some of the ISOs may contain files, which are the same (duplicates). So you might try zpaq (by compression veteran Matt Mahoney, see other posts here): http://mattmahoney.net/dc/zpaq.html. Source: almost 2 years ago

• So this is new... Windows Defender deleted a VM snapshot last night!

  Now I use zpaq (http://mattmahoney.net/dc/zpaq.html) Open source, fast, reliable, best compression I have ever seen, it beats RAR and 7zip. Almost forever incremental backups work great. It has 2 or 3 issues I can live with. Source: about 2 years ago

• Differential changes into 1 file ?

  I use ZPAQ for incremental backups, it does compression and depuplication, making it easy to extract the state from any given time. Source: about 2 years ago

• How do I open a .zpaq file on Mnajaro? I tried Ark but cannot open it.

  Check this out. Seems you can download the zip file and compile it on yourself. But I did not try it, so I am not sure if it will be useful. Source: about 2 years ago

• QOI – The Quite OK Image Format

  If that is your taste, you should definitely take a look at zpaq [1] which uses an embedded bytecode with a not-too-long specification [2]. It is tuned for compression algorithms but any general algorithm can be programed; for example there is a project that turns zpaq into (slower) Brotli [3]. [1] http://mattmahoney.net/dc/zpaq.html [2] http://mattmahoney.net/dc/zpaq206.pdf [3] https://github.com/pothos/zpaqlpy. - Source: Hacker News / about 2 years ago

• Hi everyone, i'm a 16 year old gamedev. I just released my retro horror game, if you could check it out that would mean a lot :D

  Winrar is proprietary and cost 33usd, 7zip is free open-source software, and compresses better :) (Actually an argument can be made that you should use Zpaq, it compresses even better than 7zip and is also FOSS, but it's not supported by common decompression programs like winrar or 7zip, meaning most people won't know how to decompress it. Compression sizes: ZIP: 45MB Winrar: 40MB 7zip: 33MB Zpaq: 30MB. Source: about 2 years ago

• WINRAR - I have 20GB RAR file that I update daily. Issue is, whenever I want to add new file to that archive, it has to update all of those files that are pre-existing, it lasts just as long as it took it to create that 20GB archive. Is there a way to update archive without updating entire archive?

  Use the better suited format zpaq - Journaling archiver for incremental backups There are plugins for total commander to ease managing, or gui linked there. Source: over 2 years ago

• Data rot: What are the prevention and the cure measures?

  For long-term storing, have a look at ZPAQ, http://mattmahoney.net/dc/zpaq.html. Source: over 2 years ago

• Does anyone know of a file archive program that can effectively do chunk-level deduplication?

  There are some “hybrids” out there like Tarsnap, or Zpaq but most of them usually attempt to build on top of existing archiving tools. Please not that I have no idea if any of the above tools will eat your data. I’ve never used them, though I hear good things about tarsnap. Source: over 2 years ago

• Restic: Backups Done Right

  Might add zpaq (C++) - http://mattmahoney.net/dc/zpaq.html to the list. - Source: Hacker News / over 2 years ago