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157 lines
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ReStructuredText
157 lines
5.5 KiB
ReStructuredText
.. include:: global.rst.inc
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.. _quickstart:
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Quick Start
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===========
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This chapter will get you started with |project_name|. The first section
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presents a simple step by step example that uses |project_name| to backup data.
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The next section continues by showing how backups can be automated.
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A step by step example
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----------------------
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1. Before a backup can be made a repository has to be initialized::
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$ attic init /somewhere/my-repository.attic
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2. Backup the ``~/src`` and ``~/Documents`` directories into an archive called
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*Monday*::
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$ attic create /somewhere/my-repository.attic::Monday ~/src ~/Documents
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3. The next day create a new archive called *Tuesday*::
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$ attic create --stats /somewhere/my-repository.attic::Tuesday ~/src ~/Documents
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This backup will be a lot quicker and a lot smaller since only new never
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before seen data is stored. The ``--stats`` option causes |project_name| to
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output statistics about the newly created archive such as the amount of unique
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data (not shared with other archives)::
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Archive name: Tuesday
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Archive fingerprint: 387a5e3f9b0e792e91ce87134b0f4bfe17677d9248cb5337f3fbf3a8e157942a
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Start time: Tue Mar 25 12:00:10 2014
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End time: Tue Mar 25 12:00:10 2014
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Duration: 0.08 seconds
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Number of files: 358
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Original size Compressed size Deduplicated size
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This archive: 57.16 MB 46.78 MB 151.67 kB
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All archives: 114.02 MB 93.46 MB 44.81 MB
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4. List all archives in the repository::
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$ attic list /somewhere/my-repository.attic
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Monday Mon Mar 24 11:59:35 2014
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Tuesday Tue Mar 25 12:00:10 2014
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5. List the contents of the *Monday* archive::
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$ attic list /somewhere/my-repository.attic::Monday
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drwxr-xr-x user group 0 Jan 06 15:22 home/user/Documents
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-rw-r--r-- user group 7961 Nov 17 2012 home/user/Documents/Important.doc
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...
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6. Restore the *Monday* archive::
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$ attic extract /somwhere/my-repository.attic::Monday
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7. Recover disk space by manually deleting the *Monday* archive::
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$ attic delete /somwhere/my-backup.attic::Monday
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.. Note::
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Attic is quiet by default. Add the ``-v`` or ``--verbose`` option to
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get progress reporting during command execution.
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Automating backups
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------------------
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The following example script backs up ``/home`` and
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``/var/www`` to a remote server. The script also uses the
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:ref:`attic_prune` subcommand to maintain a certain number
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of old archives::
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#!/bin/sh
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REPOSITORY=username@remoteserver.com:repository.attic
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# Backup all of /home and /var/www except a few
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# excluded directories
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attic create --stats \
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$REPOSITORY::hostname-`date +%Y-%m-%d` \
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/home \
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/var/www \
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--exclude /home/*/.cache \
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--exclude /home/Ben/Music/Justin\ Bieber \
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--exclude '*.pyc'
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# Use the `prune` subcommand to maintain 7 daily, 4 weekly
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# and 6 monthly archives.
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attic prune -v $REPOSITORY --keep-daily=7 --keep-weekly=4 --keep-monthly=6
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.. _encrypted_repos:
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Repository encryption
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---------------------
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Repository encryption is enabled at repository creation time::
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$ attic init --encryption=passphrase|keyfile PATH
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When repository encryption is enabled all data is encrypted using 256-bit AES_
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encryption and the integrity and authenticity is verified using `HMAC-SHA256`_.
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All data is encrypted before being written to the repository. This means that
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an attacker that manages to compromise the host containing an encrypted
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archive will not be able to access any of the data.
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|project_name| supports two different methods to derive the AES and HMAC keys.
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Passphrase based encryption
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This method uses a user supplied passphrase to derive the keys using the
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PBKDF2_ key derivation function. This method is convenient to use since
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there is no key file to keep track of and secure as long as a *strong*
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passphrase is used.
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.. Note::
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For automated backups the passphrase can be specified using the
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`ATTIC_PASSPHRASE` environment variable.
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Key file based encryption
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This method generates random keys at repository initialization time that
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are stored in a password protected file in the ``~/.attic/keys/`` directory.
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The key file is a printable text file. This method is secure and suitable
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for automated backups.
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.. Note::
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The repository data is totally inaccessible without the key file
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so it must be kept **safe**.
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.. _remote_repos:
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Remote repositories
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-------------------
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|project_name| can initialize and access repositories on remote hosts if the
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host is accessible using SSH. This is fastest and easiest when |project_name|
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is installed on the remote host, in which case the following syntax is used::
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$ attic init user@hostname:repository.attic
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or::
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$ attic init ssh://user@hostname:port/repository.attic
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If it is not possible to install |project_name| on the remote host,
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it is still possible to use the remote host to store a repository by
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mounting the remote filesystem, for example, using sshfs::
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$ sshfs user@hostname:/path/to/folder /tmp/mymountpoint
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$ attic init /tmp/mymountpoint/repository.attic
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$ fusermount -u /tmp/mymountpoint
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However, be aware that sshfs doesn't fully implement POSIX locks, so
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you must be sure to not have two processes trying to access the same
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repository at the same time.
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