Compress snapshot backups with duplicates

Posted by Usavich on Super User See other posts from Super User or by Usavich
Published on 2012-11-10T22:03:08Z Indexed on 2012/11/10 23:03 UTC
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backup

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compression

I have a set of backups of mostly photos. The directory looks sort of like this:

backup/Day1/photos/1.jpg
               .../2.jpg
backup/Day2/photos/2.jpg
               .../3.jpg
               .../4.jpg
backup/DayN/photos/2.jpg
               .../3.jpg
               .../9.jpg

Files with same name are identical. There are many duplicates. Due to the way the backup system works, it's not possible to create incremental backup directly. I always get the entire dump each day.

If I want to create a compressed archive for a date range, say Day 5~9, what is the best tool/compression algorithm to do that?

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