docs: rework and add a bit to introduction
Contributed-by: Daniela Häsler <daniela@proxmox.com> [ discussed and edited some parts live with me, Thomas ] Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Introduction
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============
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This documentation is written in :term:`reStructuredText` and formatted with :term:`Sphinx`.
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This documentation is written in :term:`reStructuredText` and formatted with
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:term:`Sphinx`.
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What is Proxmox Backup
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----------------------
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What is Proxmox Backup Server
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-----------------------------
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Proxmox Backup is an enterprise class client-server backup software,
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specially optimized for the `Proxmox Virtual Environment`_ to backup
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:term:`virtual machine`\ s and :term:`container`\ s. It is also
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possible to backup physical hosts.
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Proxmox Backup Server is an enterprise-class client-server backup software that
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backups :term:`virtual machine`\ s, :term:`container`\ s, and physical hosts.
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It is specially optimized for the `Proxmox Virtual Environment`_ platform and
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allows you to backup your data securely, even between remote sites, providing
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easy management with a web-based user interface.
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It supports deduplication, compression and authenticated encryption
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(AE_). Using :term:`Rust` as implementation language guarantees high
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Proxmox Backup Server supports deduplication, compression, and authenticated
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encryption (AE_). Using :term:`Rust` as implementation language guarantees high
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performance, low resource usage, and a safe, high quality code base.
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Encryption is done at the client side. This makes backups to not fully
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trusted targets possible.
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It features strong encryption done on the client side. Thus, it's possible to
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backup data to not fully trusted targets.
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Architecture
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------------
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Proxmox Backup uses a `Client-server model`_. The server is
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responsible to store the backup data and provides an API to create
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backups and restore data. It is possible to manage disks and
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other server side resources using this API.
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Proxmox Backup Server uses a `client-server model`_. The server stores the
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backup data and provides an API to create backups and restore data. With the
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API it's also possible to manage disks and other server side resources.
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A backup client uses this API to access the backed up data,
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i.e. ``proxmox-backup-client`` is a command line tool to create
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backups and restore data. We deliver an integrated client for
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QEMU_ with `Proxmox Virtual Environment`_.
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The backup client uses this API to access the backed up data. With the command
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line tool ``proxmox-backup-client`` you can create backups and restore data.
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For QEMU_ with `Proxmox Virtual Environment`_ we deliver an integrated client.
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A single backup is allowed to contain several archives. For example,
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when you backup a :term:`virtual machine`, each disk is stored as a
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separate archive inside that backup. The VM configuration also gets an
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extra file. This way, it is easy to access and restore important parts
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of the backup without having to scan the whole backup.
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A single backup is allowed to contain several archives. For example, when you
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backup a :term:`virtual machine`, each disk is stored as a separate archive
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inside that backup. The VM configuration itself is stored as an extra file.
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This way, it is easy to access and restore only important parts of the backup
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without the need to scan the whole backup.
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Main Features
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-------------
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:Proxmox VE: The `Proxmox Virtual Environment`_ is fully
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supported. You can backup :term:`virtual machine`\ s and
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:Support for Proxmox VE: The `Proxmox Virtual Environment`_ is fully
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supported and you can easily backup :term:`virtual machine`\ s and
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:term:`container`\ s.
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:GUI: We provide a graphical, web based user interface.
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:Performance: The whole software stack is written in :term:`Rust`,
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to provide high speed and memory efficiency.
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:Deduplication: Incremental backups produce large amounts of duplicate
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data. The deduplication layer removes that redundancy and makes
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incremental backups small and space efficient.
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:Deduplication: Periodic backups produce large amounts of duplicate
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data. The deduplication layer avoids redundancy and minimizes the used
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storage space.
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:Incremental backups: Changes between backups are typically low. Reading and
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sending only the delta reduces storage and network impact of backups.
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:Data Integrity: The built in `SHA-256`_ checksum algorithm assures the
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accuracy and consistency of your backups.
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@ -59,43 +63,43 @@ Main Features
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:Remote Sync: It is possible to efficiently synchronize data to remote
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sites. Only deltas containing new data are transferred.
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:Performance: The whole software stack is written in :term:`Rust`,
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to provide high speed and memory efficiency.
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:Compression: Ultra fast Zstandard_ compression is able to compress
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:Compression: The ultra fast Zstandard_ compression is able to compress
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several gigabytes of data per second.
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:Encryption: Backups can be encrypted client-side using AES-256 in
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:Encryption: Backups can be encrypted on the client-side using AES-256 in
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GCM_ mode. This authenticated encryption mode (AE_) provides very
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high performance on modern hardware.
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:Open Source: No secrets. You have access to all the source code.
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:Web interface: Manage Proxmox backups with the integrated web-based user
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interface.
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:Support: Commercial support options are available from `Proxmox`_.
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:Open Source: No secrets. Proxmox Backup Server is free and open-source
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software. The source code is licensed under AGPL, v3.
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:Support: Enterprise support is available from `Proxmox`_.
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Why Backup?
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-----------
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Reasons for Data Backup?
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------------------------
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The primary purpose of a backup is to protect against data loss. Data
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loss can be caused by faulty hardware, but also by human error.
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The main purpose of a backup is to protect against data loss. Data loss can be
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caused by faulty hardware but also by human error.
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A common mistake is to delete a file or folder which is still
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required. Virtualization can amplify this problem. It is now
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easy to delete a whole virtual machine by pressing a single button.
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A common mistake is to accidentally delete a file or folder which is still
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required. Virtualization can even amplify this problem; it easily happens that
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a whole virtual machine is deleted by just pressing a single button.
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Backups can serve as a toolkit for administrators to temporarily
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store data. For example, it is common practice to perform full backups
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before installing major software updates. If something goes wrong, you
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can restore the previous state.
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For administrators, backups can serve as a useful toolkit for temporarily
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storing data. For example, it is common practice to perform full backups before
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installing major software updates. If something goes wrong, you can easily
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restore the previous state.
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Another reason for backups are legal requirements. Some data must be
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kept in a safe place for several years by law, so that it can be accessed if
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required.
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Another reason for backups are legal requirements. Some data, especially
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business records, must be kept in a safe place for several years by law, so
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that they can be accessed if required.
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Data loss can be very costly as it can severely restrict your
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business. Therefore, make sure that you perform a backup regularly
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and run restore tests.
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In general, data loss is very costly as it can severely damage your business.
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Therefore, ensure that you perform regular backups and run restore tests.
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Software Stack
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@ -107,14 +111,14 @@ Software Stack
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License
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-------
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Copyright (C) 2019 Proxmox Server Solutions GmbH
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Copyright (C) 2020 Proxmox Server Solutions GmbH
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This software is written by Proxmox Server Solutions GmbH <support@proxmox.com>
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Proxmox Backup is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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Proxmox Backup Server is free and open source software: you can use it,
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redistribute it, and/or modify it under the terms of the GNU Affero General
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Public License as published by the Free Software Foundation, either version 3
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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``WITHOUT ANY WARRANTY``; without even the implied warranty of
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