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Your iWeb site "lives" in a file named Domain.sites2 located in HD > Users > (your account) > Library > Application Support > iWeb.

If you did an Archive & Install it should still be there & you just need to "tell" iWeb where it is.

If you did an Erase & Install, hopefully you have a back up of your user folder somewhere.
 
If you failed to backup the iWeb folder which is in the Application Support folder you are sunk. You will have to recreate your site if you are using .Mac that is. If you are using an alternative provider you should be able to download all of your files.
 
If you failed to backup the iWeb folder which is in the Application Support folder you are sunk. You will have to recreate your site if you are using .Mac that is. If you are using an alternative provider you should be able to download all of your files.

That is very true, but actually it gets worse than that sorry to say. :(

Just getting the files back off an alternate host will help somewhat (as any images used on the site will be back in hand then) but the problem is that will only retrieve the published results from iWeb, not the actual Domain.sites file from the /Users/username/Library/Application Support/iWeb folder!

Since the Domain.sites file is where the current "working" copy of the site that iWeb understands is stored, if that were not backed up the poster's goose, shall we say, is cooked and ready for serving.... :(

The only fix is to rebuild the site from scratch right after the poster gets back from the store and installs a backup drive (and does a complete system backup to it! to avoid a problem of this nature in the future.

Sorry for the bad news.
 
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