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You have a multi-part archive. Restoring it is already covered in our documentation so I'll give you the short version.

Upload the .jpa, .j01, .... files on your new server.

Upload kickstart.php.

Run kickstart.php.

You can only select the JPA file. This is normal. Kickstart will automatically find the rest of the files.

Think about having a very long book, like Les Miserables by Victor Hugo. The print version would run a couple thousand pages. A book that big is very hard to handle. Instead, publishers will bind it into 3-4 volumes, each one a much smaller book that you can actually hold in your hands and read easily. You can't start reading from any book and make sense of the story. You need to read them in the correct order. Only then you extract the whole story in your head in a way that makes sense.

This is the concept behind split archives. If the backup was a single file the file would be too big to handle. Instead, we split it into smaller files. However, each file is like a volume of Les Miserables. You can't read it on its own; it makes no sense. You have to read all files in a specific order: .j01, .j02, .j03, ..., .jpa. Kickstart knows that. When you select the JPA file it starts looking for all the parts in this order: .j01, .j02, .... When it can't find a numbered part it reads the .jpa file which is always the final part.