Description:
Customers often inquire how NetVault backs up data to media on Unix/Linux (physical tape, virtual tape, etc.)
For more information on this topic, please see the Module 3 Advanced Administration Part One-Web-based Training
BakBone uses a modified version of CPIO to backup and restore data to media (physical tape, virtual tape). The modifications are minimal, but they're (usually) enough to not allow a default version of CPIO to restore data from a NetVault tape.
1. Like tar, CPIO archives files and directories. With CPIO, you can copy files to tape or disk, archive empty directories, swap byte order, create portable ASCII archives, and read from and write to standard output. CPIO is also useful for copying files and directories when the cp(1) command is unable to do so. For example, you cannot use cp to copy a directory to a different file system.
2. The dd program reads from a specified input file (stdin is the default), performs whatever conversions you specify, and writes the result to a specified output file. (stdout is the default.) It is not specifically a backup tool, but has many extremely useful features, including the ability to:
*skip specific blocks in an archive
*skip blocks of output
*change input and output block size
*copy a specific number of blocks
*perform various data conversions such as byte swapping
In a nutshell...
CPIO works on a filesystem level
DD works on a block level
We do offer a "Raw Device" backup option under each client that would be more comparable to DD.
NOTE:
BakBone Software does not provide support for either CPIO or DD Backup/Restore. This information is provided AS/IS without warranty of any kind
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