I often use graphs at a glance to determine the general load on my servers and how it has evolved over the months. The problem is that when zabbix gathers a lot of data it becomes difficult to see the trend I need.

Some machines are idle during the day and busy during the night when performing backups, others are the other way around. When viewing a graph for a week or less it's really easy discern the server load during the nightly backups and the load during work hours. When viewing the trend over a few months the graph becomes useless with all the spikes.

It would be AWESOME if there were a way to select the hours between which data would be selected for the graphs. So there could be a way to show the load during work hours (9:00 to 18:00) for several months and make this data useful for future hardware upgrades, disregarding the huge and constant loads during the night.
(a case would be disk latency where I have no problem if it spikes over 40ms/IO during the nightly backups, but I would like it to be below 40ms/IO during the day when users are working on the file server).