When you create or edit a Windows, Linux or UNIX backup job, some of the following options are available in the Advanced Backup Options dialog box.
Back up files opened for write
If the Backup files opened for write option is selected, files are backed up if they are open for writing or shared reading during the backup. Files that are open for exclusive writes cannot be backed up.
When this option is selected, inconsistencies in the backup can occur if an open file is modified during the backup process.
Suppress archive bit processing
Note: This option is only available for Windows backup jobs.
In some operating systems, an archive attribute is placed in a file when the file is created or modified. The archive attribute indicates that the file needs to be backed up.
If the Suppress archive bit processing option is selected, the Agent does not clear the archive attribute when it backs up a file. If you use other programs that rely on the archive attribute, make sure that the Suppress archive bit processing option is not selected.
If the Suppress archive bit processing option is not selected, the Agent clears the archive attribute when it backs up a file.
Back up a single instance of all selected hard linked files
Note: This option is only available for Linux and UNIX backup jobs.
A hard link is a reference, or pointer, to data on a storage volume. More than one hard link can be associated with the same data. Hard-linked files cannot cross disk boundaries and only exist on the same disk.
If the Back up a single instance of all selected hard linked files option is selected, only one copy of the data is backed up, along with all of the hard links. When the data is restored, both the data (with a new inode) and the hard links are restored. When this option is selected, a pre-scan process is required. The pre-scan reads through the file system, gets each inode and stores it in a map. The larger the file system, the more memory this map requires and the more time it takes to process. However, the resulting backup size is smaller.
If the Back up a single instance of all selected hard linked files option is not selected, the data is backed up separately for each hard link. When the data is restored, the hard-link relationship will not be re-established. Each file will be restored individually and applications depending on hard links may not be automatically restored. When this option is not selected, the backup is faster but the total backup size is larger.