My Miranda makes backups from profile when Miranda starts and close.
But after a time it, my backups folder will much bigger and bigger.
i have found that winrar can massively pack it to a very small size with the dos command RAR.exe m -s -ep1 -m5 -md256 -scal -- "%cd%\AutoBackups\AutoBackups" AutoBackups\*.dat
it needs rar with minimal version 5.0 and my rar file have 854 profile files included that would extracted 7212MB but packed if have only 39,11MB
yes i know that nobody really needs there much backup files but on there compress rate it is for me indifferent
maybe if 7z can packed there much too, than it would be nice to integrated this as only zip format