I can share some information about restoring data files and clarify things for you, @Iren7.

Renaming your file is used so it will not prompt for any duplicate or existing names. 

In addition to that, you can permanently delete the previous data first and then restore it with the same filename. But before doing so, make sure to have a backup copy of it before deleting the said file. 

Then, to restore your data, you can follow the steps below:

1. In QuickBooks, proceed to the File menu and choose Open or Restore Company.
2. Click Restore a backup copy and then Next.
3. Select Local Backup and then Next.
4. Browse your computer for your backup company file. It should look like this: [Your company name].qbb.
5. Choose a folder to decide where to save your restored company file. Then select Open.
6. When you're ready, select Save. 

You can check out this article for additional info: Restore a backup of your company file.

If you run into problems restoring your backup file, here's an article you can utilize to resolve the issue: Fix backup company file issues in QuickBooks Desktop.

Feel at ease to leave a comment below if you have further questions about managing your data in QuickBooks. I'm just a post away. Stay safe!