This post shows how to save server disk space using images compression. The following commands do not loss the picture quality, but only remove unnecessary data from them.
To compress all JPG images in the directory /var/www run this command:
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find /var/www -type f -name "*.jpg" | xargs jpegoptim -m85 --strip-all --all-progressive |
To compress all PNG images in the directory /var/www run this command:
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find /var/www -type f -name "*.png" | xargs pngquant | xargs optipng -O3 |
In this way you can add these commands to CRON:
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0 3 * * * 0 find /var/www -type f -name "*.jpg" | xargs jpegoptim -m85 --strip-all --all-progressive |
Above task will run every Sunday at 03:00 am.
The compression consumes a lot of CPU resources, sometimes close to 100%. I recommend you perform compression when there are few visitors.