vos_backup - Creates a backup volume for a single read/write volume


vos backup -id <volume name or ID> [-cell <cell name>] [-noauth] [-auth] [-localauth] [-encrypt [<yes|no>]] [-verbose] [-noresolve] [-config <configuration file>] [-help]


The vos backup command clones the indicated read/write volume to create a backup version. The backup version is a read-only snapshot of the read/write volume at the time the command is executed.

The backup version is stored on the same File Server and partition as the read/write volume. The backup volume's name is the name of the read/write volume with the .backup extension appended. Unlike .readonly sites created using the vos_addsite(1) command and populated with the vos_release(1) command, the .backup version cannot be replicated and can only exist on the same partition as the read/write volume.

A .backup volume is useful for providing end users a self-service mechanism to recover accidentally deleted files and directories. Use the fs_mkmount(1) command to create a mount point to the .backup volume where it can be accessed. There are two common practices:

The .backup volume ID is allocated by the Location Service when the read/write volume is created with the vos_create(1) command. If a backup version already exists when vos backup is executed, the new clone replaces it.

To create a backup version of multiple volumes with a single command, use the vos_backupsys(1) command.


-id <volume name or ID>

Specifies either the complete name or volume ID number of the source read/write volume.

-cell <cell name>

Names the cell in which to run the command. Do not combine this argument with the -localauth flag. For more details, see vos(1).


Assigns the unprivileged identity anonymous to the issuer. Do not combine this flag with the -localauth flag. For more details, see vos(1).


Obtains an authentication token using the server encryption key with the highest key version number in the local /etc/yfs/server/KeyFileExt file. The resulting token never expires and has Super User privileges. Do not combine this flag with the -cell argument or -noauth flag. For more details, see vos(1).


Use the calling user's tokens from the kernel or as obtained using the active Kerberos ticket granting ticket to communicate with the Volume Server and Location Service. This is the default if neither -localauth nor -noauth is given.

Since this option is the default, it is usually not useful for running single command line operations. However, it can be useful when running commands via vos_interactive(1) or vos_source(1), since otherwise it would be impossible to switch from, for example, -localauth back to using regular tokens during a bulk operation.


Produces on the standard output stream a detailed trace of the command's execution. If this argument is omitted, only warnings and error messages appear.

-encrypt [<yes|no>]

Enables or disables encrytion for the command so that the operation's results are not transmitted across the network in clear text.


Shows all servers as IP addresses instead of the reverse DNS lookup hostname. -noresolve useful when troubleshooting no such volume and volume moved errors.

-config <configuration file>

Set the location of the configuration file to be used. The default file is /etc/yfs/yfs-client.conf.


Prints the online help for this command. All other valid options are ignored.


The following message confirms that the command succeeded:

   Created backup volume for I<volume name>


The following example creates a backup version of the volume user.smith.

   % vos backup user.smith
   Created backup volume for user.smith


The issuer must be listed in the /etc/yfs/server/UserListExt file on the File Server specified by the -server argument and on each Location Server. If the -localauth flag is included, the issuer must instead be logged on to a server with an account capable of reading the /etc/yfs/server/KeyFileExt file.


fs_mkmount(1), vos(1), vos_addsite(1), vos_backupsys(1)


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