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SIMATIC WinCC: How Towards read Information Originating From last week

Dear Everybody
     I have asked someone about tag logging but I still confuse about this function.
I need to read data from last week may be last year. I think , I should use the tag logging function.
This is the condition about my system.
1. Some time my system need to close but I need to keep all data before deactivate runtime.
2. I can select time range for read data.
I don't used to use tag logging function but I used to read data from SQL server when I activated runtime.
Do you have any idea or suggestion me ?
Best Regards
Adameve

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