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Alteryx Server does a pretty good job of tracking all the information you need in order to find out who ran a workflow at a given time, even if that workflow has been deleted from the Gallery.
However, if I need to identify what that workflow actually did on a specific date, and that version is no longer available on the Gallery, it gets really hard to track down.
There are some posts throughout the community on leveraging the MongoDB to try and reconstruct this, but in some cases the workflow is "Chunked" and becomes impossible for an end user to reconstruct.
I spoke to support about this recently and they suggested that by using the Scheduler, I could schedule the historical instance of the workflow and then "Really quickly" grab it when it was reconstructed from the temporary staging folder used by our Alteryx Server. This has a few concerns, among them, finding a way to run this workflow so that the files can be created but it has no impact on tables, for instance if the given workflow drops a table as part of its execution. Additionally, the only way to schedule with a different set of permissions in a 1-Worker environment is to change the default "Run Workflows As" to a different user, who also needs permission to access all files on the Alteryx Server. This can also impact any other Scheduled or Gallery job that is executed while this recovery is underway, effectively causing downtime to do file recovery.
These restrictions are specific enough as to be impractical for most organizations using Alteryx Gallery/Server.
I think this could be solved by adding to the Scheduler an option along the lines of "Download a copy of the workflow", available to administrators. Ideally this copy could include some important metadata, like when that version of the workflow was uploaded, who uploaded it, and its ID/Version Number from the Gallery.
This would go a long way towards making it easier to Audit and respond to requests for historical information about Alteryx Workflows on the Server, and since the Alteryx Engine can already recreate these workflows, I think that a basic version of this feature could simply save out that temporary file, rather than executing it.