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Thread: Compressing two (or more) large but similar files

  1. #1
    Join Date
    Aug 2008
    Saint Petersburg, Russia
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    Compressing two (or more) large but similar files

    What is the best solution for compressing several large files that are similar to each other?
    A real-life example could be the daily backup of database files or mailboxes. Their sizes may be up to several GBs, but day-to-day they would contain just a couple of hundred megabytes of different data.
    Is there a way to use this to save space on the archive storage if I want to have multiple copies?

  2. #2
    Matt Mahoney's Avatar
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    May 2008
    Melbourne, Florida, USA
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    Use long range LZ77 like srep or dedupe like zpaq. If you are making regular backups (not one-time compression) then use dedupe. srep gives better compression but can't be updated without decompressing first.

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