Java Heap Space
The java process that the software runs on was not able to allocate enough memory to perform it’s operations. This is normally the result of having a huge number of files and/or data in the backup.
For Mac OS X:
Open “config.ini” and “RunOBC.bat” with a text editor and change the values in bold text.
The bolded values affect the java heap size, which determines the maximum amount of memory used.
Increasing 384 to 768 should be enough for larger installations
SET JAVA_OPTS=-Xms32m -Xmx512m -Dsun.java2d.noddraw
Try increasing 512 to 768, very large installations may require higher values