Cumulative Incremental backup schedule is run as a Full backup

Article:TECH21049  |  Created: 2002-01-05  |  Updated: 2013-10-23  |  Article URL
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Technical Solution




Cumulative Incremental backup schedule is run as a Full backup


There is an instance when a full backup will run rather then a cumulative backup, even though the schedule is for a cumulative backup.

It has been found that if there are files or folders on a volume with creation dates from before the beginning of "CTIME" (00:00:00 UTC, January 1, 1970) and a Cumulative Incremental backup job is configured to run; a Full backup job will be run instead of a Cumulative Differential backup job. This condition only needs to exist within one file or folder on the entire drive.

NOTE: VERITAS NetBackup (tm) uses the UNIX ctime for all time stamps. In NetBackup, all time stamps in logs and databases are represented by a 10-digit string that represents the current time in seconds that have elapsed since the Epoch (00:00:00 UTC, January 1, 1970). Time zone and daylight savings corrections are made before string  generation. In NetBackup, the 10-digit ctime number can be converted to a standard date and time by running the NetBackup command line utility "bpdbm" with the  -ctime XXXXXXXXXX switch from a command prompt from the <Install_Path>\Netbackup\bin directory:

<Install_Path>\Netbackup\bin\> bpdbm -ctime 1108000000
"108000000 = Wed Feb 09 20:46:40 2005"


To determine if a file or folder has an unacceptable creation date on the drive showing the problem, the following command can be run from the command line on a Windows server:

C:\> dir *.* /S /TC > C:\creation-date.txt

The command will create the file C:\creation-date.txt. The command will also scan all files and folders from where it was run and list the creation date for each file and folder. This command may need to be run from the root of each drive to determine the creation dates for all files on that particular drive.

An example of the output:

Directory of C:\

02/16/2005     5:42 PM    132    creation-date.txt
04/18/1969     6:22 AM     436   Tech-notes.txt

The date in the first column on the left represents the creation date of the folder.

NOTE: If the above command is run from a Windows NT machine, the date will be returned in a two-digit format. For example, 07/30/02. In order to see the four digit date format, the drive will need to be mapped to a Windows 2000 or XP server. Then run the command from the Windows 2000 or XP server of the mapped drive.

If it has been determined that there is a file date outside the normal range (1969 as an example of being outside the range), then the date will need to be changed to something within an acceptable range before the cumulative backup will run. A creation date of the current year would yield the best results. In the above example, opening the file Tech-notes.txt in Notepad, then copying the contents of this file to a new *.txt file in Notepad and saving the new file, while deleting the original, would save the data to a file with a new creation date and resolve this issue.

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