Cacti - http://www.cacti.net/

Exported Graphs

Graph - QiTSW03 - Traffic - GS724T Gigabit/3 (LAN QiTVZ01 - Total BW)
Hourly (1 Minute Average)

Daily (5 Minute Average)

Weekly (30 Minute Average)

Monthly (2 Hour Average)

Yearly (1 Day Average)