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The messages you get do not come from our software. They come from a very old version of FOF (2.x) which is included in Joomla itself. We discontinued FOF 2 in June 2016, more than 3 years ago. These are actually notices thrown by PHP 7.3. As far as I know, they were fixed in Joomla 3.9.12.

I'd also like to note that PHP 3.0.7 is a version from more than 20 years ago and incompatible with any version of Joomla, even 1.0.0 from 15 years ago. Is it possible that the live server's PHP version is different? If so, what is it? If it's a 7.0 release your problem might actually be that your site's extensions are too old for (therefore incompatible with) PHP 7.3.

Otherwise you can follow the standard troubleshooting procedure for white screens. A white page or a page with a 500 Internal Server Error is, in fact, either a .htaccess issue to a PHP fatal error in disguise.

First, let's see if it is a .htaccess issue. Try renaming the .htaccess file in your site's root to htaccess.bak If there is a .htaccess file in the site's administrator directory, try renaming it as well. If that solves the problem, the issue was with a directive in your .htaccess file. We'd like to recommend you to try removing directives from your .htaccess until you find the one which causes the problem.

If that doesn't help, the error you are receiving is in fact a PHP error in disguise. First, check your server's error logs (not the access logs) immediately after visiting the page which throws the error. There should be an exact description of the PHP fatal error which occurred.

If you do not know where to find these logs and you have access to the Joomla! administrator area, please log in to your site's back-end, go to Global Configuration, click on the Server tab and set the Error Reporting to Development. Try visiting the problem page again.

If you still get a blank page, edit your configuration.php file and put the following code right after the final closing curly brace ( this is what a curly brace looks like --> } ) but before the closing PHP tag (it looks like ?> that is a question mark and a greater-than sign):

ini_set( 'display_errors', true );
error_reporting( E_ALL ); 

Try visiting the problem page again.

Please note that if you can not understand what the PHP error message means, just copy and paste it here verbatim so that we can take a look and point you to the right direction.

Did you also add the code to the configuration.php file?

Unfortunately there is no information there I can use :(

I know for sure that this has not something to do with the restoration itself but I want to help by pointing you to the right direction. For that to happen I need a copy of the backup archive.

Please upload the backup archive somewhere you can share a link to, e.g. Dropbox, OneDrive, Google Drive, ... Then start a new private ticket with the subject "Backup archive for ticket 31983". In the message of the ticket please say that it's the file I asked you on ticket 31983 and paste the link to the file. If I don't see the ticket my staff will assign it to me and I will take a look on it over the weekend.