Every month I usually compress all my database dumps into a rar file.
I was very happy with the compression rate, as each compressed file was usually about 30MB, with a compression rate of 99%.
Since a few weeks ago, without having touched anything (neither in the compressor parameters nor in the dump system), the compression rate has dropped to 70% and now the compressed file occupies about 1.50GB.
Any idea why this is happening?
Thanks!