Iwp naar iwzip 
Author: Henk Z.
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Is there a way of restoring website by converting iwp naar iwzip?
Kind Regards,
Henk Zieremans
www.acvv.nl
Posted on the
No there is not, you need to create a backup (IWZIP) yourself in step5.
Once online it's not reversable.
But try the backup function:
IT should also work for neweer versions if there is a backup available.
https://helpcenter.websitex5.com/en/post/47713
Goodluck!
And although probably too late; create a backup regurly from step 5 export project and save it on a different medium.