My need is to create a development site for my production

Hello
My need is to create a development site for my production Wordpress site.
After reading many things I downloaded Snapshot.
First, I export data from 1 blog (the production one) -> export is OK. I have a full archive of many Mo (400 Mo, NB: I keep the default parameter of the export)
Then I create my second website on another platform. Setup of wordpress and Snapshot is ok.
Finally, I try to restore we Zip i've previously uploaded by FTP to my snaphot directory but I had an issue something like: "error, go to settings part". I try to click on setting but now nothing is working. The link setting redirect to the URL of my production server. No more dev server. Now I only have blank pages.
Could you please help ?
NB: as I am in testing mode I could remove my setup in dev platform, no matter. Just tell me What I did wrong ?
THanks of your help !