Store Up Treasure for Yourselves...?

We are told to store up treasures for ourselves... 

"Do not lay up for yourselves treasures on earth, where moth and rust destroy and where thieves break in and steal, BUT LAY UP FOR YOURSELVES TREASURES IN HEAVEN, where neither moth nor rust destroys and where thieves do not break in and steal. For where your treasure is, there your heart will be also." - Matthew 6:19-21 (emphasis added)

Just not on earth! 

Where is your treasure being stored?