Ubuntu Manpage: backintime - a simple backup tool for Linux.

Provided by: backintime-common_1.0.34-0.1_all

NAME

       backintime - a simple backup tool for Linux.

       This is command line tool.  The graphical tools are: backintime-gnome and backintime-kde4.

SYNOPSIS

       backintime  [  --profile  <profile  name> | --profile-id <profile id> ] [ --keep-mount ] [
       --quiet ] [ --config PATH ] [ --checksum ] [ --backup | --backup-job | --snapshots-path  |
       --snapshots-list  |  --snapshots-list-path  |  --last-snapshot  |  --last-snapshot-path  |
       --unmount | --benchmark-cipher [SIZE] |  --pw-cache  [start|stop|restart|reload|status]  |
       --decode  [PATH] | --restore [WHAT [WHERE [SNAPSHOT_ID]]] | --help | --version | --license
       ]

DESCRIPTION

Back In Time is a simple backup tool for Linux. The backup is done by taking snapshots of
a specified set of folders.

All you have to do is configure: where to save snapshots, what folders to backup. You can
also specify a backup schedule: disabled, every 5 minutes, every 10 minutes, every hour,
every day, every week, every month. To configure it use one of the graphical interfaces
available (backintime-gnome or backintime-kde4).

It acts as a 'user mode' backup tool. This means that you can backup/restore only folders
you have write access to (actually you can backup read-only folders, but you can't restore
them).

If you want to run it as root you need to use 'su'.

A new snapshot is created only if something changed since the last snapshot (if any).

A snapshot contains all the files from the selected folders (except for exclude patterns).
In order to reduce disk space it use hard-links (if possible) between snapshots for
unchanged files. This way a file of 10Mb, unchanged for 10 snapshots, will use only 10Mb
on the disk.

When you restore a file 'A', if it already exists on the file system it will be renamed to
'A.backup.currentdate'.

For automatic backup it use 'cron' so there is no need for a daemon, but 'cron' must be
running.

Modes
Local
Store snapshots on local HDD's (internal or USB). The drive has to be mounted before
creating a new snapshot.

Local encrypted
Store encrypted snapshots on local HDD's (internal or USB). Backintime uses 'encfs'
with standard configuration to encrypt all data. You have to be member of group fuse
to use this. In terminal type 'sudo adduser <USER> fuse'. To apply changes you have to
logout and login again.

SSH
With Mode set to SSH you can store the backup on a remote host using the
SecureShellHost protocol (ssh). The remote path will be mount local using sshfs to
provide file-access for the graphical interface and the backup process. Rsync and
other processes called during backup process will run directly on the remote host
using ssh.

To prepare your user account for ssh-mode you have to add the user to group 'fuse' by
typing 'sudo adduser <USER> fuse' in terminal. To apply changes you have to logout
and login again.

Next you have to create a password-less login to the remote host (for further
informations look at http://www.debian-administration.org/articles/152). Type in
terminal 'ssh-keygen -t dsa' hit enter for default path and enter a passphrase for the
private key.

Finally type 'ssh-copy-id -i ~/.ssh/id_dsa.pub <REMOTE_USER>@<HOST>' and enter your
password on remote host.

In Settingsdialog you need to set the host and remote user. If you enter a relative
path (no leading / ) it will start from remote users homedir. The password has to be
the passphrase for your private key.

Cipher (the algorithm used to encrypt the data during transfer)
To optimize performance you can choose the cipher used by ssh. Depending on your
environment you can have a massive speed increase compared to the default cipher.

--benchmark-cipher will give you an overview over which cipher is the fastest in your
environment.

If the bottleneck of your environment is the hard-drive or the network you will not
see a big difference between the ciphers. In this case you should stay on 'default'.

Please read security informations about the cipher before using them in untrusted
networks (Wifi, Internet). Some of them (Arcfour, 3DES, ...) should be handled as not
secure anymore.

Remote Host
If your remote host is an embedded Linux NAS or any other device with limited
functions, you could run into some problems caused by feature-less commands. For
example some devices may not have hardlink support for 'cp', 'chmod' and 'rsync'. In
this case it may help to install so-called Optware on your device if available.

WARNING: THIS IS ONLY FOR EXPERIENCED USERS!
If you don't know how to compile packages and how to modify a Linux system you should
NOT try to do this. There is a significant chance to break your device and make it
completely unusable with the following procedure. We will not take any warranty for
this. Make a backup of your device before proceed! You have been warned!

You should install at least packages called 'bash', 'coreutils' and 'rsync'. You will
have to change users default shell from '/bin/sh' to '/opt/bin/bash' in '/etc/passwd'.
Add '/opt/bin:/opt/sbin:' to the start of the PATH environment variable in
'/etc/profiles'.

To check if it does work you can compare the output of '/bin/cp --help' and
'/opt/bin/cp --help'. If 'ssh <user>@<host> cp --help' called from your PC will print
the same as '/opt/bin/cp --help' called on the remote host (via interactive ssh
session) you are ready to go.

If you have questions on how to install and configure the Optware please refer to the
community of your device. You can also take a look on BackInTime FAQ on Launchpad
https://answers.launchpad.net/backintime/+faqs

If you successfully modified your device to be able to make backups over ssh, it would
be nice if you write a 'How to' on Launchpad's Answers so we can add this to the FAQ.

SSH encrypted
Store encrypted snapshots on remote hosts using SSH. Backintime uses 'encfs --reverse'
to mount the root filesystem '/'. Rsync will sync this encrypted view of '/' to a
remote host over SSH. All encoding will be done on the local machine. So the password
will never be exposed to the remote host and you can use the (normally) more powerful
processor in you local machine for encryption instead of weak NAS CPU's. The downside
on this is 'encfs --reverse' does not support 'Filename Initialization Vector
Chaining' and 'Per-File Initialization Vectors' from the standard configuration (take
a look at 'man encfs' for further informations).

Because of all data is transferred encrypted the log output shows encrypted filenames,
too. In the Logview-Dialog you can use 'decode' option to decrypt the paths
automatically or you can use 'backintime --decode' to manually decrypt paths.
Backintime will show all snapshots decoded so you can browse all files as normal.

Exclude does not support wildcards ('foo*', '[fF]oo', 'fo?') because after encoding a
file these wildcards can't match any more. Only separate asterisk that match a full
file or folder will work ('foo/*', 'foo/**/bar'). All other excludes that have
wildcards will be silently ignored.

Please refer to the 'SSH' section above for informations on setting up the SSH
connection.

Password
If 'Save Password to Keyring' is activated BackinTime will save the Password into
GnomeKeyring (Seahorse) or KDE-KWallet. Both are secure password storages which encrypt
the password with the users login-password. So they can only be accessed if the user is
logged in.

A backup cronjob during the user isn't logged in can not collect the password from
keyring. Also if the homedir is encrypted the keyring is not accessible from cronjobs
(even if the user is logged in). For these cases the password can be cached in RAM. If
'Cache Password for Cron' is activated BackinTime will start a small daemon in user-space
which will collect the password from keyring and provide them for cronjobs. They will
never be written to the harddrive but a user with root permissions could access the daemon
and read the password.

user-callback
During backup process the application can call a user callback at different steps. This
callback is "$XDG_CONFIG_HOME/backintime/user-callback" (by default $XDG_CONFIG_HOME is
~/.config).

The first argument is the profile id (1=Main Profile, ...).

The second argument is the profile name.

The third argument is the reason:

1 Backup process begins.

2 Backup process ends.

3 A new snapshot was taken. The extra arguments are snapshot ID and snapshot
path.

4 There was an error. The second argument is the error code.
Error codes:

1 The application is not configured.

2 A "take snapshot" process is already running.

3 Can't find snapshots folder (is it on a removable drive ?).

4 A snapshot for "now" already exist.

OPTIONS (use these before other actions)

       --profile <profile name>
              select profile by name

       --profile-id <profile id>
              select profile by id

       --keep-mount
              Don't    unmount    on    exit.   Only   valid   with   --snapshots-list-path   and
              --last-snapshot-path.

       --quiet
              suppress status messages on standard output.

       --config PATH
              read config from PATH.

       --checksum
              force to use checksum for checking if files have been changed. This is the same  as
              'Use  checksum  to detect changes' in Options. But you can use this to periodically
              run checksums from cronjobs.

ACTIONS

       -b, --backup
              take a snapshot now (if needed)

       --backup-job
              take a snapshot (if needed) depending on schedule rules (used for cron jobs)

       --snapshots-path
              display path where is saves the snapshots (if configured)

       --snapshots-list
              display the list of snapshot IDs (if any)

       --snapshots-list-path
              display the paths to snapshots (if any)

       --last-snapshot
              display last snapshot ID (if any)

       --last-snapshot-path
              display the path to the last snapshot (if any)

        --unmount
              Unmount the profile.

       --benchmark-cipher [SIZE]
              Show a benchmark of all ciphers for ssh transfer.

       --pw-cache [start|stop|restart|reload|status]
              Control the Password Cache Daemon. If no argument is given the Password Cache  will
              start in foreground.

       --decode [PATH]
              decode encrypted PATH. If no PATH is given Backintime will read paths from standard
              input.

       --restore [WHAT [WHERE [SNAPSHOT_ID]]]
              Restore file WHAT to path WHERE from snapshot SNAPSHOT_ID. If arguments are missing
              they will be prompted. To restore to the original path WHERE can be an empty string
              '' or just press Enter at the prompt. SNAPSHOT_ID can be an index (starting with  0
              for   the   last   snapshot)   or   the   exact   SnapshotID   (19  caracters  like
              '20130606-230501-984')

       -h, --help
              display a short help

       -v, --version
              show version

       --license
              show license

AUTHOR