General Computing
Updated Thu, 08 Sep 2022 07:23:53 GMT

compression for large Maildir structure

I run a Debian Linux mailserver for a few little companies that stores its emails in a Maildir structure and therefore each mail as a seperate plain text file.

Altogether these files are as large as about 45 GB.

Even though I am backing up the files online I want to download them to store them on another physical backup media.

Evaluated statistically each 5th mail has one file attachment being as large as about 1.2MB. What would be a good compression for this files? The speed of the compression is of low priority because I do only work on archived data not the productive one.

I am not asking for the "best" solution as I know there isn't one but am looking for your recommendations.


Use tar to create an archive, then compress the archive with something simple, like plain gzip, or something that compresses better, like xz --best -e. Then transfer the compressed archive to the backup media.

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