Backing up and restoring your company file is a routine but critical task until you encounter QuickBooks Error 6123. This error can prevent the restoration of your QBB backup. Here's a clear approach:

Verify the backup file location
Make sure the backup is saved on your local hard drive and not on an external drive, cloud folder, or network share. Copy it to C:\QBBackup before restoring.

Check file integrity
Confirm the backup file size matches expectations, such as 50 MB for a mid-sized company. If your file is smaller than expected, it may have been cut off.

Rename .ND/.TLG files
Go to the folder of the restored file. Rename [company].nd and .tlg to [company].old. These network config files can block the restore process.

Reinstall QuickBooks in Admin mode
Right-click the QuickBooks icon and select Run as Administrator. This gives the necessary permissions for file access.

Temporarily disable antivirus/firewall
These programs can limit file operations. Turn them off during the restore process, then turn them back on afterward.

Use Safe Mode
Restart Windows in Safe Mode and try the restore to reduce background interference.

Detail your support requests
If you need help on forums, include the QuickBooks Desktop version, such as 2023 R3, your OS type, network/local location, a screenshot of the error, and the exact steps you have taken so far.

Providing these details helps experienced users diagnose the issue faster and give precise advice.
Read More:https://qbookassist.com/quickbooks-error-6123/