I use express tools movebak command, to move all bak files on every station to the same folder.
I then delete every file over 2 days old, I figure if you don't need it by then you never will.
I also delete the following files regularly.
plot.log
*.err
*.dmp
*.nfl
I also search for any files that contain "recover" in the title, I then make sure they have been recovered, if not, I do so then replace original file with recovered version. But check the date of the files first, the most current version is usually the right one.
Another good thing to do is purge all the drawings you can. You can download a program called smartpurger, which will purge drawings and save them with their original date format, I've saved GB of space doing this. you need to register it though, the trial version can only do a few drawings.
If your company won't buy this write a script and purge the drawings that way.
After purging, try zipping all the old drawings, you can save about 30% of a files space just by zipping it.
hope this helps.
