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cback3-span - Span staged data among multiple discs


cback3-span [switches]


This is the Cedar Backup 3 span tool. It is intended for use by people who back up more
data than can fit on a single disc. It allows a user to split (span) staged data between
more than one disc. It can't be a Cedar Backup extension in the usual sense because it
requires user input when switching media.

Generally, one can run the cback3-span command with no arguments. This will start it
using the default configuration file, the default log file, etc. You only need to use the
switches if you need to change the default behavior.

This command takes most of its configuration from the Cedar Backup configuration file,
specifically the store section. Then, more information is gathered from the user
interactively while the command is running.


The main difference between Cedar Backup version 2 and Cedar Backup version 3 is the
targeted Python interpreter. For most users, migration should be straightforward. See
the discussion found at cback3(1) or reference the Cedar Backup user guide.


-h, --help
Display usage/help listing.

-V, --version
Display version information.

-b, --verbose
Print verbose output to the screen as well writing to the logfile. When this option
is enabled, most information that would normally be written to the logfile will
also be written to the screen.

-c, --config
Specify the path to an alternate configuration file. The default configuration
file is /etc/cback3.conf.

-l, --logfile
Specify the path to an alternate logfile. The default logfile file is

-o, --owner
Specify the ownership of the logfile, in the form user:group. The default
ownership is root:adm, to match the Debian standard for most logfiles. This value
will only be used when creating a new logfile. If the logfile already exists when
the cback3 script is executed, it will retain its existing ownership and mode.
Only user and group names may be used, not numeric uid and gid values.

-m, --mode
Specify the permissions for the logfile, using the numeric mode as in chmod(1).
The default mode is 640 (-rw-r-----). This value will only be used when creating a
new logfile. If the logfile already exists when the cback3 script is executed, it
will retain its existing ownership and mode.

-O, --output
Record some sub-command output to the logfile. When this option is enabled, all
output from system commands will be logged. This might be useful for debugging or
just for reference.

-d, --debug
Write debugging information to the logfile. This option produces a high volume of
output, and would generally only be needed when debugging a problem. This option
implies the --output option, as well.

-s, --stack
Dump a Python stack trace instead of swallowing exceptions. This forces Cedar
Backup to dump the entire Python stack trace associated with an error, rather than
just progating last message it received back up to the user interface. Under some
circumstances, this is useful information to include along with a bug report.

-D, --diagnostics
Display runtime diagnostic information and then exit. This diagnostic information
is often useful when filing a bug report.


This command returns 0 (zero) upon normal completion, and six other error codes related to
particular errors.

1 The Python interpreter version is < 3.4.

2 Error processing command-line arguments.

3 Error configuring logging.

4 Error parsing indicated configuration file.

5 Backup was interrupted with a CTRL-C or similar.

6 Other error during processing.


Cedar Backup itself is designed to run as root, since otherwise it's difficult to back up
system directories or write the CD or DVD device. However, cback3-span can be run safely
as any user that has read access to the Cedar Backup staging directories and write access
to the CD or DVD device.

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