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When you are upgrading your NTA to NTA 4.0 using NTA Flow Storage, you need to decide what you want to do with your old Flow data:
If you want to have access to your historical data in the new NTA, you need to transfer them from the original Orion SQL database to the new NTA Flow Storage. To do so:
Select Migrate historical data from previous installation on the appropriate Configuration Wizard screen.
NTA automatically counts the free space required for the migration. If there isn't enough free space available on your NTA Flow Storage disk, the migration option is disabled.
If there is not enough free space available on your NTA Flow Storage disk and you still want to display your historical data in the new NTA:
Don't Migrate My Historical Data
If you don't need to see your historical Flow data in the new NTA, select the Do not migrate my historical data option in the Configuration Wizard.
You can further decide whether you want the keep the data in the original Orion SQL database or delete them permanently.