CXARC - Overview

CXARC is a data archive tool that will pack large numbers of files into as small a space as possible for easier uploading, quicker copying or greater storage capacity.

CXARC archives are designed to make highly efficient use of a normal broadband Internet connection in backing up data to a remote Internet based file store.

CXARC is also useful for squeezing more storage space out of a recordable CD, DVD or Blu-Ray disk or flash memory key.

CXARC archives also offer the facility of snapshots, that is, the ability to ask the archive to unpack all the files as they looked yesterday, or the day before, as well as the latest version. If a file was accidentally deleted, or edited and then the original version is needed, it may be available in one of the historic data snapshots.


  • Compress large amounts of storage without data loss to use less space and be faster to upload or copy.
  • De-duplicate files so if the same file appears more than once it is only stored once in the archive. On archive extraction all original copies are recreated. Even parts of a file may be de-duplicated.
  • Group many small files together into fewer, larger blocks for efficient network usage and performance.
  • Provide snapshots to recover file versions from yesterday or the day before if you need to "rewind" before a problem happened.
  • Check file integrity with a checksum to ensure no corruption could have occured between storage and recovery

CXARC currently requires a Unix/Linux like environment and is a Perl utility.

Even though CXARC was developed as part of a commerical software solution, much of the development of this, and other, COEXPANSIVE software has been made possible by the free availability of open source software and we feel an obligation to pay some of that good will back by releasing to the open source community a non-trivial, useful piece of software and CXARC is our contribution.

We are happy to provide the CXARC software and documentation on request, please see the "Contact Us" link on the right hand side of this page.