Copy and Paste Large data. 

I have a question about using Macro to copy and paste large data to another 
workbookI have data with 6000 rows running up to column AK. Is this a safe 
approach? I am going to use this copied data to update 10 pivot tables

Below is the code that I am using. 

   Workbooks.Open Filename:= _

        "S:\macro working folder\ OPS.xlsx"

  'clear any thing on clipboard to maximize available memory

   Application.CutCopyMode = False

  ActiveSheet.Select

Application.ScreenUpdating = False

Application.DisplayAlerts = False

 Range("A1").Select

 On Error Resume Next

 mylastrow = Cells.Find("*", [A1], , , xlByRows, xlPrevious).Row

 mylastcol = Cells.Find("*", [A1], , , xlByColumns, xlPrevious).Column

 mylastcell = Cells(mylastrow - 1, mylastcol).Address

 Data_range = "A1:" & mylastcell

 Range(Data_range).Select

 Selection.Copy

 ActiveWindow.Close

'Paste data into new Workbook

'------------------------------------------------------------------------------------------

Sheet("OPS").Select

Range("A1").Select

ActiveSheet.Paste

Selection.AutoFit

  'clear any thing on clipboard to maximize available memory

   Application.CutCopyMode = False

I noticed that one of the column is forcing the data to look like this but 
it looks fine when I do it without macro. 

2.01313E+12

What are my risks of using macro? I don’t want to lose data or change the 
data. 

Is there some preventive method that I need to add in my macro? 

Please help!!!

Thank!!! 

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