After I read "What is Synchronization Frequency " here: http://technet.microsoft.com/en-us/library/bb809047.aspx, and "What is a recovery point" here:http://technet.microsoft.com/en-us/library/bb809164.aspx, I still have some doubts in what exactly Synchronization Frequency's purpose is, if it can't be used to recover data. Let me ask my question by using the following example.
Say in a file protection group I setup 3 recovery points in a day, at 9AM, 12PM, and 3PM. And I setup my Synchronization Frequency as "every 1 hour". Below is what happens at each hour, in the morning:
8AM: synchronization
9AM: *recovery point
10AM: synchronization
11AM: synchronization
12PM: *recovery point
So my questions are:
Q1. What are the synchronizations taken place at 10AM and 11AM for? Are they simply making the recovery point creation at 12PM to complete quicker, becuase DPM server only need to sync changes in an hour (between 11 and 12), instead of in 3 hours (between 9 and 12, if no synchronization was configured between each recovery point) ?
Q2. I read from the article that at each synchronization, changes are transferred to DPM server and thenapplied to the replica. However, it did not create a recovery point.
So, what would be the difference difference if I chose 15 minutes orJust before a recovery point, as my Synchronization Frequency interval? I mean by doing sync's more frequently, I am still getting only 3 recovery points in a day. Then why do I want to sync it more frequently? If my server crashed at 9:50, but the synchronization took place at 9:45 is not a recovery point and can't be used to recover data, why would I want to sync it every 15 minutes?