Wow this 7zip format really is amazing! So that you know, now a days I backup a log of server data via archives so that there is records of previous server data in case I need it. In addition I also now keep records of all the servers old log files so that I have a backup of the stats and server event data. This is important as the data needs to be deleted every year or the server will flip out. I used to use winrar but hearing about 7zip more and more I decided to give it a go. It compressed (the 2010 pub server logs) over 3GB of log files to 170MB. Now it did take about 12min to do that but more importantly is that I can extract it in about 2min. This is really helping me get this clean up work done. Doing disc clean up will take all night (yes manually in that I will be up all night doing this). This is to get the system ready for the new updates and to get everything fixed this week.
So for those of you that have not I really suggest you give 7zip a try. If you backup a lot of txt files or game data in archives it is a lot better than .rar