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SQL Backup Percentage Complete using SSMS GUI
Open SSMS, right click on a database then select Tasks > Back Up. A screen similar to the below image will open. After you select all of the backup options and click OK, you can monitor the progress on the lower left side of the GUI as shown in the below image. This will give you an idea of the status of the backup.
SQL Backup Percentage Complete using T-SQL Script
Backup showing every 1% of progress
BACKUP DATABASE [backup_restore_progress] TO
DISK = N'E:\backup_restore_progress_backup_full.bak'
WITH NOFORMAT, NOINIT, NAME = N'backup_restore_progress-Full Database Backup',
STATS = 1
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