The New version Artica 4.30.00000 Service Pack 209 allows you to evaluate the size of your statistics.
On the left menu, the section Statistics / Artica Statistics Communicator displays the status of your Statistics
The PostgreSQL section in this status shows you an evaluation of the disk size used for a daily statistics.
In this example, each day use about 12 MB of disk size, the means for a yearly retention ( 365 * 12 ) statistics will consume about 4 380 MB ( 4.3GB )
It is important to check the capacity of your main hard drive to determine if statistics will not turn your system out of disk space.