With Nero BackItUp, you can verify an existing backup. Nero BackItUp verifies whether or not the backup can be used for a successful restore process. During this process, data integrity is checked, and the backed up data is compared to the source data. If you carry out the verification right after the backup and have not modified any data in the meantime, you can use the feature to verify whether or not all data was backed up successfully (data verification).   
To verify the backup, proceed as follows:
1.
Click the Backup > Verification menu.
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The Verify your backups screen is displayed.
2.
Select a backup from the selection list or select a different backup using the Browse buttons. If the backup is located on a FTP server, click the Browse FTP button.
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Verification option buttons are available and information about the chosen backup is displayed.
3.
If you selected a file backup, specify the type of check that should be used for the file backup:
1.
If you want to verify whether all files have been backed up, select the Verify by contents option button. 
2.
If you want to compare the CRC checksum of the backed up files with the CRC checksum of the original files, select the Verify by CRC option button. . 
3.
If you want to verify whether files have been changed after the backup, select the Verify by modified option button. . 
4.
If you selected a drive backup, specify the type of check that should be used for the drive backup:
1.
If you want to verify whether all files have been backed up, select the Verify by contents option button. 
2.
If you want to verify the availability of your backup, select the Verify backup file format option button. . 
5.
Click the  Nero BackItUp backup now24 389988107 Verifying a Backup button.
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The verification is carried out.
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After a successful verification, a window that notifies you of the verification’s result is displayed.

 

 
 
The message “The data verification process has been completed successfully” means that the verified backup is error-free and is suitable for restoring. 
If the message “The data verification has failed” appears, there is no guarantee that the verified backup is suitable for a restore process.  There can be several reasons, e.g. the backup file can have errors or there is no data on the computer for a comparison.
 
 
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The message window is closed. You have verified the backup.
Backup
Copying data from the computer to an alternative storage medium. Backups are created in a special format with the help of a backup program.
Restore
Restore stands for restoring data to a previous condition or to copying data by using a backup copy that was created previously and a backup program, e.g. Nero BackItUp.
CRC
Cyclic Redundance Check refers to an error-detection procedure used during the transmission or copying of data. A checksum is calculated with a defined amount of data at the beginning, and provided with the data block. After the operation has ended, the checksum is calculated again and compared to the first value. Deviations indicate the presence of errors.

Verifying a Backup