{"id":13222,"date":"2026-05-18T07:34:31","date_gmt":"2026-05-18T05:34:31","guid":{"rendered":"https:\/\/flyingsupporter.ch\/?p=13222"},"modified":"2026-05-18T09:12:51","modified_gmt":"2026-05-18T07:12:51","slug":"why-backup-servers-should-never-be-part-of-the-same-domain","status":"publish","type":"post","link":"https:\/\/flyingsupporter.ch\/en\/2026\/05\/18\/warum-backupserver-niemals-teil-derselben-domaene-sein-sollten\/","title":{"rendered":"Why backup servers should never be part of the same domain"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"13222\" class=\"elementor elementor-13222\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-52adb76 e-flex e-con-boxed e-con e-parent\" data-id=\"52adb76\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-68f15df e-con-full e-flex e-con e-child\" data-id=\"68f15df\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-44cba34 e-con-full e-flex e-con e-child\" data-id=\"44cba34\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-48725cb elementor-widget__width-inherit elementor-widget elementor-widget-text-editor\" data-id=\"48725cb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Backups are often seen as the last resort after a cyber attack, a hardware defect or human error. Nevertheless, a central security error is still ignored in many companies today: The backup server is located within the same Active Directory domain as the productive systems.<\/strong><\/p><p><b>In an emergency, this can lead to the backups being compromised or deleted.<br \/><br \/><\/b><\/p><h4>The basic problem: The domain admin controls everything<\/h4><p>In a classic Windows environment, a domain administrator has far-reaching rights. If this account is compromised - for example through phishing, malware or ransomware - the attacker often gains access to all systems within the domain.<\/p><p>If the backup server is also located in this domain, the consequences are serious:<\/p><ul><li>Backups can be deleted<\/li><li>Backup jobs can be manipulated<\/li><li>Restore points disappear<\/li><li>Backup software can be deactivated<\/li><li>Encryption Trojans also reach the backups<\/li><\/ul><p><br \/>This means that the backup loses its actual purpose: independent recovery in the event of a disaster.<br \/><br \/><\/p><h4>The most important principle: separate backup infrastructure<\/h4><p>A secure backup strategy is based on isolation. The backup server should therefore never be completely dependent on the same domain whose systems it is supposed to protect.<\/p><p>Proven approaches are:<\/p><ul><li>own separate domain<\/li><li>Workgroup instead of domain membership<\/li><li>Dedicated management networks<\/li><li>Separate administrator accounts<\/li><li>restricted firewall rules<\/li><li>Immutable storage or offline backups<\/li><\/ul><p><br \/>The goal is clear: even if the production domain is compromised, the backup environment must continue to function independently.<br \/><br \/><\/p><h4>Service user instead of domain administrator<\/h4><p>Another common error is the use of a domain administrator account for backup jobs.<\/p><p>Although many backup solutions require access to servers, databases or virtual machines, they do not require full domain admin rights.<\/p><p>Dedicated service accounts should be used instead:<\/p><ul><li>with minimum necessary authorisations<\/li><li>only for defined systems<\/li><li>without interactive login<\/li><li>with strong password and rotation<\/li><li>separately per backup service or system area<\/li><\/ul><p><br \/>This significantly reduces the attack surface.<br \/><br \/><\/p><h4>Principle of minimum rights<\/h4><p>The so-called \u00abLeast Privilege Principle\u00bb is one of the most important security principles of modern IT infrastructures.<\/p><p>For example, a backup service requires:<\/p><ul><li>Access to certain shares<\/li><li>Snapshot rights on hypervisors<\/li><li>Database read rights<\/li><li>Rights to secure certain systems<\/li><\/ul><p><br \/>However, it does not usually require complete control over the entire domain.<\/p><p>The fewer rights a compromised account has, the lower the potential damage.<br \/><br \/><\/p><h4>Today, ransomware thinks of backups first<\/h4><p>Modern attacks no longer only target productive data. Professional ransomware groups are actively looking for:<\/p><ul><li>backup servers<\/li><li>Backup software<\/li><li>NAS systems<\/li><li>Veeam instances<\/li><li>Hypervisor accesses<\/li><li>Storage systems<\/li><\/ul><p><br \/>Because attackers know that: Without functioning backups, the probability of a ransom payment increases massively.<\/p><p>It is therefore no longer enough to have a backup \u00absomewhere\u00bb. The backup environment itself must be specially protected.<br \/><br \/><\/p><h4>Best practices for secure backup environments<\/h4><p>The following measures have proved their worth:<\/p><p><strong>1. isolate the backup server<br \/><\/strong>No direct membership in the productive domain or clear separation via separate positions of trust.<\/p><p><strong>2. use your own service accounts<br \/><\/strong>No use of domain admin accounts for backup software.<\/p><p><strong>3. use immutable backups<br \/><\/strong>Backups must not be deletable or modifiable for defined periods of time.<\/p><p><strong>4. test backup restore<br \/><\/strong>A backup is only valuable if the restoration works reliably.<\/p><p><strong>5. create offline or air-gap copies<br \/><\/strong>At least one backup copy should be physically or logically separated.<br \/><br \/><\/p><p><strong>A backup within the same security zone as the productive systems often only offers deceptive security. If the domain is compromised, the backups are often also affected.<\/strong><\/p><p><strong>Backup servers should therefore be operated outside the domain to be protected wherever possible - combined with separate service accounts and minimal authorisations.<\/strong><\/p><p><strong>After all, a backup only provides real protection if it remains unassailable in an emergency.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5e20699 elementor-blockquote--skin-boxed elementor-blockquote--align-center elementor-widget elementor-widget-blockquote\" data-id=\"5e20699\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"blockquote.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<blockquote class=\"elementor-blockquote\">\n\t\t\t<p class=\"elementor-blockquote__content\">\n\t\t\t\t<b>Your partner for servers and backups - Flying Supporter<br><br><\/b> <b><a href=\"https:\/\/flyingsupporter.ch\/en\/contact-team\/#form\">Do you have any questions<\/a>?<\/b>\n<br>We will be happy to help you.\t\t\t<\/p>\n\t\t\t\t\t<\/blockquote>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-605597d elementor-align-center elementor-widget elementor-widget-button\" data-id=\"605597d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/flyingsupporter.ch\/en\/contact-team\/#form\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Get in touch now<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Backups are often seen as the last resort after a cyber attack, a hardware defect or human error. Nevertheless, a central security error is still ignored in many companies today: The backup server is located within the same Active Directory domain as the productive systems.<\/p>","protected":false},"author":25,"featured_media":13223,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"page_builder":"","footnotes":""},"categories":[95,74,77,73],"tags":[],"post_folder":[138],"class_list":["post-13222","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-empfehlungen","category-news","category-sicherheit","category-technik"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"Backups gelten oft als letzte Rettung nach einem Cyberangriff, einem Hardwaredefekt oder menschlichen Fehlern. 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