I'm not sure I follow your reasoning here. The usual reason for taking backups is to be able to restore the servers back to the point in time that the chosen backup was done.
Re-installing does not require backups as you are repeating the SAS install process from a SAS software depot.
If you simply want to rebuild your SAS servers from scratch, then a complete system restore for all server storage should do what you want.
Perhaps you could explain your use case in more detail we would be able to provide more guidance.