I came across this question in related questions which basically asks the same thing. Is there a way of exporting and importing subscriptions to SharePoint-hosted reports that were created in SQL Server Reporting Services?
Scenario: During report re-deployments, reports are deleted and re-created, and the associated subscriptions are deleted (orphaned?). Is there a way (automated - either by a custom tool or via SharePoint/SSRS APIs) that I can export out the subscriptions before deleting the associated report and import back the subscriptions after the report has been redeployed?