minor changes

Author: AbhishekMallick-MS

articles/backup/tutorial-sql-backup.md

@@ -177,7 +177,7 @@ To create a backup policy:
 3. Right-click on a database, and choose "Backup now".
 4. Choose the Backup Type (Full/Differential/Log/Copy Only Full) and Compression (Enable/Disable).
    - *On-demand full* retains backups for a minimum of *45 days* and a maximum of *99 years*.
-   - *On-demand copy only full* accepts any v0alue for retaintion.
+   - *On-demand copy only full* accepts any value for retention.
    - *On-demand differential* retains backup as per the retention of scheduled differentials set in policy.
    - *On-demand log* retains backups as per the retention of scheduled logs set in policy.
 1. Select OK to begin the backup.