How do I batch import multiple site archives?
Go to Site Archive
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Select the Site Archive tool from the Tool Menu in the Administration Workspace.
Select Batch Import/Export.
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Click Choose File to locate your batch import file.

Once you have selected the batch import file, click Import.

Import file format.
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Your import file should list the target site id followed by a comma and then the archive id in the siteid-archive format, one archive per line.