Hi All,
Very new to ZenDesk here and am currently creating a number of reports and dashboards but one of them has got me stumped. I am trying to create a backlog report showing the number of unresolved tickets by the month they were reported. Anyone got any suggestions?

Backlog dataset allows you to report on Backlog in 2 different ways Backlog Recorded and End of period.
Just so you can understand well the difference (It will be important to respond to your question) I have taken this from another article we have.
"If you use the date field of Backlog recorded, you are aggregating data.
The Backlog end of period looks at backlog count at the end of the selected period of time.
For example, this is the backlog count over a week for a random account:
10 backlog tickets on Monday, 11 on Tuesday, 10 on Wednesday, 11 on Thursday, 10 on Friday, 9 on Saturday, and 9 on Sunday.
If you use Time - Backlog recorded, the result is 70. But if you use Backlog end of period, the result is 9."
I am saying it to confirm you can see the backlogs for the month in 2 ways, but none of them will allow you to report on the ticket created date.
In both attributes, it will return the backlog tickets, not taking in consideration when these tickets were created. You can see how many tickets were not solved yet at the end of the month or a sum of the result at the end of each day, but cannot filter or classify it by the date of the ticket creation, because this is not an attribute in Backlog history dataset.
Hope it helps to clarify, and feel always free to post your questions here.