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92 lines
2.9 KiB
ReStructuredText
92 lines
2.9 KiB
ReStructuredText
.. include:: global.rst.inc
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.. _generalusage:
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General Usage
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=============
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The following examples showcases how to use |project_name| to backup some
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important files from a users home directory.
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Initialize a local :ref:`repository <repository_def>` to store backup
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:ref:`archives <archive_def>` in (See :ref:`encrypted_repos` and
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:ref:`remote_repos` for more details)::
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$ darc init /somewhere/my-backup.darc
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Create an archive containing the ``~/src`` and ``~/Documents`` directories::
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$ darc create -v /somwhere/my-backup.darc::first-backup ~/src ~/Documents
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Create another archive the next day. This backup will be a lot quicker since
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only new data is stored. The ``--stats`` option tells |project_name| to print
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statistics about the newly created archive such as the amount of unique data
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(not shared with other archives)::
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$ darc create -v --stats /somwhere/my-backup.darc::second-backup ~/src ~/Documents
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List all archives in the repository::
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$ darc list /somewhere/my-backup.darc
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List the files in the *first-backup* archive::
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$ darc list /somewhere/my-backup.darc::first-backup
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Restore the *first-backup* archive::
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$ darc extract -v /somwhere/my-backup.darc::first-backup
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Recover disk space by manually deleting the *first-backup* archive::
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$ darc delete /somwhere/my-backup.darc::first-backup
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Use the ``prune`` subcommand to delete all archives except a given number of
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*daily*, *weekly*, *monthly* and *yearly* archives::
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$ darc prune /somwhere/my-backup.darc --daily=7 --weekly=2 --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 encryption time::
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$ darc init --passphrase | --key-file
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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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|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 and
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secure as long as a *strong* passphrase is used.
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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 ``~/.darc/keys/`` directory.
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This method is secure and suitable 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 as the
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host is accessible using SSH and |project_name| is installed.
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The following syntax is used to address remote repositories::
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$ darc init user@hostname:repository.darc
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or::
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$ darc init ssh://user@hostname:port/repository.darc
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