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Your question appears to have two separate issues; the maintenance of excess repeating tasks, and managing how data in OmniFocus is viewed.

Quote:
Originally Posted by Neville310 View Post
The challenge is checking them off after having a back log of these tasks. Omnifocus continue displaying these tasks well in the future. So one begins checking off these tasks and thinks: "whoa, I am really behind on these tasks." Then a quick glance to the inspector and the start date is a month later.

I quickly unchecked these tasks to today. Now, I have multiple duplicates in my projects. So the repeatable task is listing 50 times. How do you clean these duplicates without deleting the future tasks? I am not sure if it relates to my perspective view. Omnifocus is showing the Inbox perspective.
I presume your repeating settings are, for example, repeat daily. You did the tasks but it was not checked off in OmniFocus and a back log occurred. Once you check off a repeating tasks a new identical task is created within the parameters you have set. So, for a task that is to repeat every day, the next task it will generate is for the following day from the date of the task which was checked. Interesting to note, that if you check a repeating task from last week, it does not create a task for tomorrow. The task created is for one week ago minus a day. From reading your post this seems like what has happened to your data.

You have two general options here after determining the one you want to continue to use and deleting all the remaining future repeating tasks; make a point to do a short daily review in order to check off all of these small tasks and prevent a back log, or modify the repeating task so it repeats a specific period after completed. The modification of the task would allow a task to repeat a day after complete to be created to complete again tomorrow. If you do not mark the task tomorrow, once you do mark it complete it will add a new task for the next day. OmniFocus will recreate the future tasks for a repeating task according to its parameter, even if you delete the 50 which were already created. You do need to keep one so you can mark it complete and trigger the creation of a new task.

Quote:
Originally Posted by Neville310 View Post
This thorough cleaning out and review kills my GTD system. I need insight on dealing with repeatable tasks and their idiosyncrasies. Again, I know how to set repeatable tasks and their purpose. But other GTD systems do not display future task until the relevant date. Why is Omnifocus giving me future tasks when the start date is next month or six months from now?
This sounds like you are looking at a complete list of all tasks and not just the ones which are available now. If you check you view setting you possibly can adjust them to show only available tasks and this should remove task with a future start date.