Hi @sakura_snow_blossom ,
It is expected that Exchange Server 2013 that is uninstalled from AD cannot be recovered with WSB.
Because when the uninstall is complete, the attributes and containers used by Exchange 2013 in AD will be removed. It will be unrecoverable.
Therefore, after migration, we often recommend that users shut down the old Exchange server for a period of time or put it in maintenance mode for a period of time before uninstalling the old Exchange server to ensure that everything is working properly.
You can refer to this article to retire Exchange Server 2013:Decommissioning Exchange Server 2013 - Microsoft Community Hub
Currently, because Exchange 2013 has been removed, if you need to use Exchange 2013 again, I recommend that you refer to the steps to migrate from Exchange 2013 to Exchange 2019:
Install the new Exchange Server 2013 in your environment and migrate mailboxes.
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