Thanks everyone who replied
Instead of backing up 11gb
I found an easy way to safely delete \~ directory
ls \~
gave some files under the directory. There were actually 2 subdirectories and one file I have
accidentally created from a java program. So I deleted them one by one. 3 steps.
Then I did
rm -ir \~
which prompted me to delete \~ directory and it deleted it.
-i option prompts you so you will know if you are deleting your mail or source code :)
Thanks again Vano