hdup(1) 						      General Commands Manual							   hdup(1)

NAME

       hdup - harddisk duplicator/harddisk backupper - backup to harddisk

SYNOPSIS

       hdup [ OPTION ] SCHEME HOST [ @USER@REMOTEHOST ] (1st format)
       hdup [ OPTION ] restore HOST DATE DIRECTORY [ @USER@REMOTEHOST ] (2nd format)

DESCRIPTION

       Hdup is used to backup a filesystem. Features include:

       o      incremental backups: monthly, weekly and daily dumps,

       o      encryption of the archive (via mcrypt or GPG),

       o      compression of the archive (bzip/gzip/lzop/none),

       o      possibility to transfer the archive to a remote host,

       o      possibility to restore the archive from a remote host,

       o      ability to split up archives,

       o      no obscure archive format (it is a normal compressed tar file), and

       o      simple to use.

       The behaviour of hdup is controlled by its configuration file (see hdup.conf(5)). Internally hdup uses GNU tar to actually create the back-
       ups.

   First format
       When using the 1st format hdup performs a backup. Remember: hdup pushes a backup from the localhost to the remote host.

       The sort of backup is specified by SCHEME:

       monthly
	      Make a full (null) dump of the filesystem.

       weekly Make an incremental dump of the filesystem relative to the latest monthly dump. If hdup cannot find a monthly dump it will complain,
	      unless always backup is on. Then a monthly dump will be performed.

       daily  Make  an	incremental dump of the filesystem relative to the latest weekly dump. If hdup cannot find a weekly dump it will complain,
	      unless always backup is on. Then a weekly dump will be performed.

       HOST is the host of which hdup should perform the backup. This should match a '[HOST]' statement in the configuration file. The directories
       of  that  host  (specified with 'dir = dir1, dir2', ...) will be backed up to the directory specified with 'archive dir = dir'.	If HOST is
       not found no backup will be made.

       @USER@REMOTEHOST is the host to which the archive should be transfered. This must include the user name. E.g @miekg@elektron.atoom.net.	It
       is  illegal  to	specify the colon ':'. hdup must be present on the remote host. The location of this remote hdup is specified using remote
       hdup.

       Any program capable of transferring files can used for this purpose. Currently tested is ssh. Other programs like rsync	(not  tested)  may
       also work. Any program with the following characteristics will do:

       o      must be usable as a filter (read from stdin, write to stdout),

       o      must support user@remotehost syntax.

   Second format
       When  using the 2nd format a previous backed up filesystem is restored.	Remember: hdup pushes a restore from the remote to the local host.
       This is opposite from the backup operation!

       HOST is the host who's archives should be restored.

       DATE everything up to this date will be restored. hdup will look for the most recent monthly archive,  then  the  most  recent  weekly  and
       finally	for  the  daily to pad up to date given. The DATE can either be specified as DD-MM-YYYY (date spec = default), as YYYY-MM-DD (date
       spec = iso) or as MM-DD-YYYY (date spec = american). This is controlled from the configuration file.

       A special date is 'static' which instructs hdup to look in the 'static' directory. This is used when 'no history = yes'. This is  dangerous
       to  use	because hdup will overwrite the old backup file with the new one. When your system crashes during the overwrite you have no backup
       at all! Only use this when you really don't have room for two monthly backups.

       Another special date is 'today' which instructs hdup to use the current date.

       DIRECTORY tells hdup to which directory the archive should be untarred to. Be very careful when running hdup as root and specifying '/'	as
       the  directory.	Version  1.4 and above refuses to restore to '/'.  This can be overridden by specifying 'force = on/yes' in the configura-
       tion.

       @USER@REMOTEHOST is the host to which the archive should be restored.  This must include the user name. E.g @miekg@elektron.atoom.net.	As
       as  version  1.6.6 it is illegal to specify the colon ':'. On the remosthost and in DIRECTORY the archive is restored. hdup must be present
       on the remote host.

   Status message
       When hdup is finished with its current operation it will print an overview message:

       Hdup version.:  1.6.6

       Host.........:  elektron
       Date.........:  2003-02-02
       Scheme.......:  monthly
       Archive......:  elektron.2003-02-02.monthly.tar.gz
       Encryption...:  no
       Archive size.:  257k
       Elapsed......:  0:01:27
       Status.......:  successfully performed backup

       Which can be mailed to you via cron.

OPTIONS

       -c, --config=config
	      Location of the configuration file. The default location of hdup's configuration file is /etc/hdup/hdup.conf.

       -s, --specific=file
	      Restore a specific file from an archive. file must be the full path to the file, relative paths will not work.

       -i, --ignore-tar
	      Ignore tar errors when restoring.

       -I, --ignore-conf
	      Ignore errors in the configuration file.

       -P, --patched_tar
	      Tar is patched so that it can handle --no-recursion, --listed-incremental and --files-from together. This options enables two things
	      in hdup; 1) directory info is written to 'filelist' and 2) --no-recursion is given to tar.

	      This solves the bug whereby hdup wouldn't include directory information in the archives.

       -d, --dryrun
	      Do a dryrun - don't do anything with the filesystem

       -q, --quiet
	      Suppress the output of the subprocesses (like 'tar' and 'ssh').

       -q -q, --quiet --quiet
	      Suppress the logging output from hdup.

       -q -q -q, --quiet --quiet --quiet
	      No logging at all. Even no overview message.

       -V     Be more verbose.

       -V -V  Be even more verbose. This will show which files are backed up by hdup IF you also supply the -D option.

       -h, --help
	      A help message.

       -v, --version
	      Show the version of hdup.

       -D, --debug
	      Show a lot of information which can aid debugging.

       The  -V	and  -q options do not effect each other. A '-qqq -VV' option list will mean that hdup will show what is run, but nothing else (no
       overview message and no warning nor errors).

ENCRYPTION

       hdup can encrypt the archives, mcrypt is used for the actual encryption. As of version 1.6.25 GPG can also be used to encrypt the  archive.
       Note that currently remotely restoring a GPG encrypted archives is not working.

   mcrypt
       With mcrypt --list you get a list of the algorithms mcrypt supports:

       ...
       serpent (32): cbc cfb ctr ecb ncfb ofb nofb
       wake (32): stream
       loki97 (32): cbc cfb ctr ecb ncfb ofb nofb
       rijndael-128 (32): cbc cfb ctr ecb ncfb ofb nofb
       rijndael-192 (32): cbc cfb ctr ecb ncfb ofb nofb
       ...

       If you want to use loki97 you specify algorithm = loki97 in hdup.conf. The same goes for all the other algorithms.

   GPG
       To use GPG the following is needed. Set algorithm = gpg and key = user ID of key. In my case I've created a GPG key with user ID of 'miekg'
       so I use:
       algorithm = gpg
       key = miekg
       The key is supplied to gpg with the -r argument. See the manpage of gpg for more details.

       When restoring a GPG encrypted archive you will be prompted to unlock your private key.

AUTHOR

       Written by Miek Gieben. Wouter van Gils helped a lot with testing pre-release versions. User feedback is appreciated.

REPORTING BUGS

       Report bugs to <hdup-user@miek.nl>.

BUGS

       The %a expansion is not always the same in the prerun and postrun scripts (when using encryption).

LIMITATIONS

       Under Linux kernel version 2.2 the archive size cannot exceed two (2) Gigabyte.	If you need larger archives sizes you should upgrade  your
       kernel. You can however solve this by using chunk size. Just define your maximum allowed size, something like chunk size = 1800M and you're
       set.

       If you encrypt archives and want to restore them, you are forced to use one encryption scheme for all the backups. hdup does not store  the
       key and algorithm with the archive, thus it is impossible to restore archives that use different keys and algorithms.

COPYRIGHT

       Copyright  (C) 2001-2005 Miek Gieben. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.

SEE ALSO

       hdup.conf(5) for information about hdup's configuration file.

								    18 Mar 2003 							   hdup(1)