{"id":2100,"date":"2026-03-19T12:44:19","date_gmt":"2026-03-19T11:44:19","guid":{"rendered":"https:\/\/askem.eu\/?p=2100"},"modified":"2026-03-19T12:44:21","modified_gmt":"2026-03-19T11:44:21","slug":"sauvegardes-automatisees-avec-borgbackup-proteger-une-infrastructure-auto-hebergee","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/03\/19\/sauvegardes-automatisees-avec-borgbackup-proteger-une-infrastructure-auto-hebergee\/","title":{"rendered":"Sauvegardes automatis\u00e9es avec BorgBackup : prot\u00e9ger une infrastructure auto-h\u00e9berg\u00e9e"},"content":{"rendered":"<h1 class=\"wp-block-heading\">Sauvegardes automatis\u00e9es avec BorgBackup&nbsp;: prot\u00e9ger une infrastructure auto-h\u00e9berg\u00e9e<\/h1>\n\n\n\n<p><em>D\u00e9duplication, chiffrement et r\u00e9tention&nbsp;: mettre en place une strat\u00e9gie de backup fiable pour des services comme CKAN, Nextcloud, Gitea et PostgreSQL.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Le backup, parent pauvre de l&rsquo;auto-h\u00e9bergement<\/h2>\n\n\n\n<p>Quand on auto-h\u00e9berge une dizaine de services \u2014 portail de donn\u00e9es, forge Git, cloud collaboratif, base de donn\u00e9es \u2014 on investit naturellement dans le d\u00e9ploiement, le monitoring, la CI\/CD. Les sauvegardes, elles, arrivent souvent en dernier. Un script <code>pg_dump<\/code> lanc\u00e9 par cron, un <code>tar<\/code> copi\u00e9 manuellement sur un disque externe, parfois rien du tout. Jusqu&rsquo;au jour o\u00f9 un disque l\u00e2che, une mise \u00e0 jour corrompt une base, ou un ransomware chiffre le serveur.<\/p>\n\n\n\n<p>Une strat\u00e9gie de sauvegarde s\u00e9rieuse repose sur trois piliers&nbsp;: l&rsquo;automatisation (pas d&rsquo;intervention humaine requise), la v\u00e9rification (un backup non test\u00e9 n&rsquo;existe pas), et la r\u00e9tention (pouvoir remonter dans le temps). BorgBackup coche ces trois cases avec \u00e9l\u00e9gance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi BorgBackup<\/h2>\n\n\n\n<p>BorgBackup (ou Borg) est un outil de sauvegarde open source qui se distingue par sa d\u00e9duplication au niveau des blocs. Concr\u00e8tement, si vous sauvegardez 50 Go de donn\u00e9es et que seuls 200 Mo ont chang\u00e9 depuis la derni\u00e8re sauvegarde, Borg ne stocke que ces 200 Mo. Le gain en espace disque et en bande passante est consid\u00e9rable, surtout pour des volumes de donn\u00e9es importants comme ceux d&rsquo;un portail CKAN ou d&rsquo;une instance Nextcloud.<\/p>\n\n\n\n<p>Ses atouts principaux sont la d\u00e9duplication par blocs de taille variable (bien plus efficace qu&rsquo;une d\u00e9duplication par fichier), le chiffrement c\u00f4t\u00e9 client avec AES-256 (vos donn\u00e9es sont illisibles sur le serveur de stockage distant), la compression configurable (LZ4, ZSTD, LZMA), et une gestion fine de la r\u00e9tention avec des politiques temporelles.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Architecture typique<\/h2>\n\n\n\n<p>Dans une infrastructure auto-h\u00e9berg\u00e9e, l&rsquo;architecture de sauvegarde avec Borg suit g\u00e9n\u00e9ralement ce sch\u00e9ma&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Serveur de production<\/strong>&nbsp;: ex\u00e9cute les services (Docker, PostgreSQL, volumes). Un script d\u00e9clench\u00e9 par cron ou systemd timer pr\u00e9pare les donn\u00e9es (dumps SQL, exports) puis lance <code>borg create<\/code>.<\/li>\n\n\n\n<li><strong>D\u00e9p\u00f4t Borg local<\/strong>&nbsp;: un volume d\u00e9di\u00e9 sur le m\u00eame serveur pour les restaurations rapides. Utile en cas de suppression accidentelle, mais insuffisant en cas de panne mat\u00e9rielle.<\/li>\n\n\n\n<li><strong>D\u00e9p\u00f4t Borg distant<\/strong>&nbsp;: un second serveur (ou un service de stockage compatible SSH) re\u00e7oit les archives via <code>borg create<\/code> avec un d\u00e9p\u00f4t distant (<code>ssh:\/\/backup-server\/repo<\/code>). C&rsquo;est la protection contre la perte du serveur principal.<\/li>\n<\/ul>\n\n\n\n<p>La r\u00e8gle d&rsquo;or reste le principe 3-2-1&nbsp;: trois copies des donn\u00e9es, sur deux supports diff\u00e9rents, dont une hors site.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Initialiser un d\u00e9p\u00f4t et cr\u00e9er une premi\u00e8re archive<\/h2>\n\n\n\n<p>L&rsquo;initialisation d&rsquo;un d\u00e9p\u00f4t chiffr\u00e9 se fait en une commande&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Initialiser le d\u00e9p\u00f4t avec chiffrement\nborg init --encryption=repokey-blake2 \/srv\/backups\/borg-repo\n\n# Cr\u00e9er une archive nomm\u00e9e avec horodatage\nborg create --stats --progress \\\n  \/srv\/backups\/borg-repo::'{hostname}-{now:%Y-%m-%d_%H%M}' \\\n  \/var\/lib\/docker\/volumes \\\n  \/etc\/nginx \\\n  \/home\/deploy \\\n  --exclude '*.tmp' \\\n  --exclude '__pycache__'<\/code><\/pre>\n\n\n\n<p>La passphrase de chiffrement doit \u00eatre stock\u00e9e de mani\u00e8re s\u00e9curis\u00e9e \u2014 un fichier avec permissions restreintes (<code>chmod 600<\/code>) r\u00e9f\u00e9renc\u00e9 par la variable d&rsquo;environnement <code>BORG_PASSPHRASE<\/code>, ou mieux, un gestionnaire de secrets.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sauvegarder les bases PostgreSQL<\/h2>\n\n\n\n<p>Pour les bases de donn\u00e9es, un simple backup des fichiers du volume Docker ne suffit pas \u2014 il faut un dump coh\u00e9rent. Le workflow recommand\u00e9 est de produire un dump SQL avant chaque sauvegarde Borg&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#!\/bin\/bash\n# backup.sh \u2014 script de sauvegarde quotidienne\n\nBACKUP_DIR=\"\/srv\/backups\/dumps\"\nBORG_REPO=\"\/srv\/backups\/borg-repo\"\nexport BORG_PASSPHRASE=\"$(cat \/root\/.borg-passphrase)\"\n\n# Dump PostgreSQL (toutes les bases)\ndocker exec postgres pg_dumpall -U postgres \\\n  | gzip &gt; \"$BACKUP_DIR\/pg_dumpall_$(date +%F).sql.gz\"\n\n# Dump CKAN sp\u00e9cifique\ndocker exec ckan-db pg_dump -U ckan -Fc ckan_default \\\n  &gt; \"$BACKUP_DIR\/ckan_$(date +%F).dump\"\n\n# Sauvegarde Borg\nborg create --stats --compression zstd \\\n  \"$BORG_REPO::backup-{now:%Y-%m-%d}\" \\\n  \"$BACKUP_DIR\" \\\n  \/var\/lib\/docker\/volumes\/nextcloud_data \\\n  \/var\/lib\/docker\/volumes\/gitea_data \\\n  \/etc\/nginx\n\n# Nettoyage des dumps anciens\nfind \"$BACKUP_DIR\" -name \"*.sql.gz\" -mtime +3 -delete\nfind \"$BACKUP_DIR\" -name \"*.dump\" -mtime +3 -delete<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Politique de r\u00e9tention<\/h2>\n\n\n\n<p>Borg permet de d\u00e9finir des politiques de r\u00e9tention souples avec <code>borg prune<\/code>. L&rsquo;id\u00e9e est de garder une granularit\u00e9 fine pour les jours r\u00e9cents, puis de ne conserver qu&rsquo;un snapshot par semaine ou par mois pour l&rsquo;historique&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Garder 7 quotidiennes, 4 hebdomadaires, 6 mensuelles\nborg prune --stats \\\n  --keep-daily=7 \\\n  --keep-weekly=4 \\\n  --keep-monthly=6 \\\n  \"$BORG_REPO\"\n\n# Compacter le d\u00e9p\u00f4t (Borg 1.2+)\nborg compact \"$BORG_REPO\"<\/code><\/pre>\n\n\n\n<p>Avec cette politique, on peut remonter jusqu&rsquo;\u00e0 six mois en arri\u00e8re tout en limitant l&rsquo;espace consomm\u00e9. La d\u00e9duplication de Borg fait le reste&nbsp;: m\u00eame avec six mois d&rsquo;historique, le d\u00e9p\u00f4t reste remarquablement compact.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sauvegarde distante via SSH<\/h2>\n\n\n\n<p>Pour la copie hors site, Borg supporte nativement les d\u00e9p\u00f4ts distants via SSH. Sur le serveur de backup, on restreint l&rsquo;acc\u00e8s avec une cl\u00e9 SSH d\u00e9di\u00e9e et la directive <code>command<\/code> dans <code>authorized_keys<\/code> pour n&rsquo;autoriser que les commandes Borg&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Sur le serveur de backup \u2014 ~\/.ssh\/authorized_keys\ncommand=\"borg serve --restrict-to-path \/srv\/borg-remote\",restrict ssh-ed25519 AAAA... deploy@prod-server\n\n# Sur le serveur de production\nborg init --encryption=repokey-blake2 ssh:\/\/backup@backup-server\/srv\/borg-remote\/prod\n\nborg create ssh:\/\/backup@backup-server\/srv\/borg-remote\/prod::'{hostname}-{now}' \\\n  \/srv\/backups\/dumps \\\n  \/var\/lib\/docker\/volumes<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Automatiser et surveiller<\/h2>\n\n\n\n<p>Un timer systemd est pr\u00e9f\u00e9rable \u00e0 cron pour ce type de t\u00e2che \u2014 il offre une meilleure gestion des logs et des d\u00e9pendances&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># \/etc\/systemd\/system\/borg-backup.timer\n&#91;Unit]\nDescription=Sauvegarde Borg quotidienne\n\n&#91;Timer]\nOnCalendar=*-*-* 03:00:00\nPersistent=true\nRandomizedDelaySec=600\n\n&#91;Install]\nWantedBy=timers.target<\/code><\/pre>\n\n\n\n<p>Pour la supervision, int\u00e9grez le r\u00e9sultat de la sauvegarde \u00e0 votre stack de monitoring existante (Prometheus\/Grafana). Un simple exporter qui v\u00e9rifie la date de la derni\u00e8re archive et la taille du d\u00e9p\u00f4t suffit \u00e0 d\u00e9clencher une alerte si une sauvegarde \u00e9choue silencieusement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tester la restauration<\/h2>\n\n\n\n<p>Le point le plus critique, et le plus souvent n\u00e9glig\u00e9. Un backup qui n&rsquo;a jamais \u00e9t\u00e9 restaur\u00e9 n&rsquo;est qu&rsquo;une hypoth\u00e8se. Planifiez un test de restauration p\u00e9riodique \u2014 id\u00e9alement mensuel \u2014 sur un environnement isol\u00e9&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Lister les archives disponibles\nborg list \/srv\/backups\/borg-repo\n\n# Restaurer une archive sp\u00e9cifique dans un r\u00e9pertoire temporaire\nborg extract \/srv\/backups\/borg-repo::backup-2026-03-18 \\\n  --target \/tmp\/restore-test\n\n# V\u00e9rifier l'int\u00e9grit\u00e9 du d\u00e9p\u00f4t\nborg check --verify-data \/srv\/backups\/borg-repo<\/code><\/pre>\n\n\n\n<p>Un test de restauration complet inclut le rechargement du dump PostgreSQL dans une instance temporaire et la v\u00e9rification que les donn\u00e9es sont coh\u00e9rentes. Automatisez ce test autant que possible \u2014 un script qui restaure, v\u00e9rifie, et envoie un rapport par mail ou via un webhook est l&rsquo;investissement le plus rentable de votre strat\u00e9gie de sauvegarde.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Borg vs Restic&nbsp;: comment choisir<\/h2>\n\n\n\n<p>Restic est l&rsquo;autre grand outil open source de sauvegarde avec d\u00e9duplication. Il supporte nativement davantage de backends (S3, B2, Azure, GCS) et son format de d\u00e9p\u00f4t est con\u00e7u pour le parall\u00e9lisme. Borg, de son c\u00f4t\u00e9, offre une d\u00e9duplication l\u00e9g\u00e8rement plus efficace et une maturit\u00e9 \u00e9prouv\u00e9e. En pratique, si votre cible de stockage distant est un serveur SSH que vous contr\u00f4lez, Borg est un choix naturel. Si vous visez du stockage objet cloud (S3, MinIO), Restic sera plus adapt\u00e9. Les deux sont d&rsquo;excellents outils \u2014 le plus important est d&rsquo;en utiliser un.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">En r\u00e9sum\u00e9<\/h2>\n\n\n\n<p>Mettre en place BorgBackup sur une infrastructure auto-h\u00e9berg\u00e9e prend quelques heures. Ne pas le faire peut co\u00fbter des semaines de travail perdu. La d\u00e9duplication rend le stockage abordable, le chiffrement prot\u00e8ge les donn\u00e9es m\u00eame sur un serveur distant non ma\u00eetris\u00e9, et les politiques de r\u00e9tention permettent de remonter dans le temps sans exploser l&rsquo;espace disque. Reste le r\u00e9flexe le plus important&nbsp;: tester r\u00e9guli\u00e8rement que la restauration fonctionne. Un backup v\u00e9rifi\u00e9, c&rsquo;est la tranquillit\u00e9 d&rsquo;esprit.<\/p>","protected":false},"excerpt":{"rendered":"<p>Sauvegardes automatis\u00e9es avec BorgBackup&nbsp;: prot\u00e9ger une infrastructure auto-h\u00e9berg\u00e9e D\u00e9duplication, chiffrement et r\u00e9tention&nbsp;: mettre en place une strat\u00e9gie de backup fiable pour des services comme CKAN, Nextcloud, Gitea et PostgreSQL. Le backup, parent pauvre de l&rsquo;auto-h\u00e9bergement Quand on auto-h\u00e9berge une dizaine de services \u2014 portail de donn\u00e9es, forge Git, cloud collaboratif, base de donn\u00e9es \u2014 on [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2101,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2100","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sauvegardes automatis\u00e9es avec BorgBackup : prot\u00e9ger une infrastructure auto-h\u00e9berg\u00e9e - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D&#039;\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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