Why

Quoting Vincent Massol :

     	"Implement support for history reports in Maven. 
     	For example it would be nice to get Clover reports over time, Checkstyle reports over time, Dashboard reports over time, etc. 
     	I'm currently thinking to consider reports as project artifacts and store them in the Maven repository. 
     	A history plugin could provide support to save/load them. 
     	Another solution (probably better) involves using a lightweight database (e.g. Hypersonic SQL) 
     	and considering this database file as the artifact."