If the backup file location is set to a non-default location, the upgrade script (upgrade-tsm.cmd) may fail with the following exception when upgrading Tableau Server.
The runas user does not have permission to read the backup file: <path>
Example:
Manually grant the Runas User account full control to the backup file path folder and then rerun the upgrade script.
For more related information, see the following Product Help pages:001474485

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