How to set up EXCEL automatic backup files

The error prompt is roughly as follows: MyEclipse has detected that less than 5% of the 64MB of Perm Gen (Non-heap memory) space remains. It is strongly recommended that you exit and restart MyEclipse with new virtual machine memory paramters to increase this memory. Failure to do so can result in data loss. The recommended Eclipse memory parameters are: -vmargs -Xms128M -Xmx512M -XX:PermSize=64M -XX:MaxPermSize=128M