Let's get rid of the error you're having to save your backup file successfully, @LuanasArt. 

You can restore the latest temp file that you need. You no longer need to go back to those old files. Then, follow the troubleshooting steps provided by Tasos Savva above by setting the regional settings of your Windows computer to the locale version to create your backup file successfully. Here's how to change regional settings in Windows to the locale version of QuickBooks.

Check the following article on how to use your backup company file to restore your company file in QuickBooks Desktop.

In case you're having trouble restoring your backup file, follow the steps outlined in the following article on how to fix backup company file issues in QuickBooks Desktop.

Let me know if you need further help in creating your backup file. I'm always here to help. Have a great rest of the day!