Maybe this is "eating up" all upir precious storage space
If you have made any clockworkmod backups, they might be stored n the folder :
You can try using root explorer to move those files to the EXT SDcard, and you can also try this:
Dial "*#9900# and select option 2 "Delete dumpstate/logicat" in the prompted menu to regain some of the storage that has been used up by the system.
Aloha and Good Luck!
BTW: if you don't have an EXT SDCard, copy your backup files to a computer before you clear all the logcat stuff. You might have to someday restore your backups and that would be a safety net for you.