[{"data":1,"prerenderedAt":290},["ShallowReactive",2],{"navigation-docs_en":3,"stack-stack_en":51},[4],{"title":5,"path":6,"stem":7,"children":8,"page":25},"En","/en","en",[9],{"title":10,"path":11,"stem":12,"children":13,"page":25},"Docs","/en/docs","en/1.docs",[14,26],{"title":15,"path":16,"stem":17,"children":18,"icon":25},"Getting Started","/en/docs/getting-started","en/1.docs/1.getting-started/1.index",[19,21],{"title":20,"path":16,"stem":17,"children":-1},"Introduction",{"title":22,"path":23,"stem":24,"children":-1},"Migration Roadmap","/en/docs/getting-started/migration-fahrplan","en/1.docs/1.getting-started/2.migration-fahrplan",false,{"title":27,"path":28,"stem":29,"children":30,"page":25},"Technologies","/en/docs/technologies","en/1.docs/2.technologies",[31,35,39,43,47],{"title":32,"path":33,"stem":34,"children":-1},"Nextcloud","/en/docs/technologies/nextcloud","en/1.docs/2.technologies/1.nextcloud",{"title":36,"path":37,"stem":38,"children":-1},"Matrix / Element","/en/docs/technologies/matrix","en/1.docs/2.technologies/2.matrix",{"title":40,"path":41,"stem":42,"children":-1},"ONLYOFFICE","/en/docs/technologies/onlyoffice","en/1.docs/2.technologies/3.onlyoffice",{"title":44,"path":45,"stem":46,"children":-1},"Ubuntu Linux","/en/docs/technologies/ubuntu","en/1.docs/2.technologies/4.ubuntu",{"title":48,"path":49,"stem":50,"children":-1},"Keycloak","/en/docs/technologies/keycloak","en/1.docs/2.technologies/5.keycloak",{"id":52,"title":53,"body":54,"categories":61,"costs":184,"cta":203,"description":214,"extension":215,"hero":216,"intro":225,"meta":226,"navigation":25,"path":227,"roadmap":228,"seo":252,"stem":255,"swaps":256,"__hash__":289},"stack_en/en/6.open-source-stack.md","Your own cloud instead of iCloud.",{"type":55,"value":56,"toc":57},"minimark",[],{"title":58,"searchDepth":59,"depth":59,"links":60},"",2,[],[62,83,100,117,130,150,167],{"title":63,"icon":64,"note":65,"pairs":66},"Collaboration & Cloud","i-lucide-cloud","Nextcloud runs on a dedicated Hetzner server (from ~€16/month for 20 users) and is governed by German law alone.",[67,71,75,79],{"microsoft":68,"openSource":69,"blurb":70},"OneDrive / SharePoint","Nextcloud Files","File sync, sharing, versioning",{"microsoft":72,"openSource":73,"blurb":74},"Office Online","ONLYOFFICE Docs","Browser-based editing — full MS compatibility, integrated into Nextcloud",{"microsoft":76,"openSource":77,"blurb":78},"Microsoft Teams (Meetings)","Nextcloud Talk","Video, chat and screen-sharing — straight in the browser",{"microsoft":80,"openSource":81,"blurb":82},"Microsoft Forms","Nextcloud Forms","Surveys and forms",{"title":84,"icon":85,"note":86,"pairs":87},"Communication & Messaging","i-lucide-messages-square","Matrix/Element is used by the European Commission (32,000 staff), the German Bundeswehr and 40+ German universities.",[88,92,96],{"microsoft":89,"openSource":90,"blurb":91},"Microsoft Teams (Chat)","Element / Matrix","Federated, E2E-encrypted, no vendor lock-in",{"microsoft":93,"openSource":94,"blurb":95},"Outlook","Thunderbird","Full-featured desktop mail client with OpenPGP integration",{"microsoft":97,"openSource":98,"blurb":99},"Exchange Online","Mailbox.org","Privacy-friendly email service hosted in Germany",{"title":101,"icon":102,"note":103,"pairs":104},"Desktop & OS","i-lucide-monitor","Windows-to-Linux migration runs smoothly for standard workplaces. I check industry-specific software compatibility upfront.",[105,109,113],{"microsoft":106,"openSource":107,"blurb":108},"Windows 10/11","Ubuntu LTS","Stable day-to-day operation, long support cycles",{"microsoft":110,"openSource":111,"blurb":112},"Windows Desktop","KDE Plasma","Familiar shell for Windows switchers",{"microsoft":114,"openSource":115,"blurb":116},"Microsoft Office","ONLYOFFICE Desktop","Writer, Calc, Impress — full DOCX/XLSX compatibility",{"title":118,"icon":119,"note":120,"pairs":121},"Mobile & Smartphones","i-lucide-smartphone","For most SME staff, GrapheneOS plus the Nextcloud calendar is fully sufficient.",[122,126],{"microsoft":123,"openSource":124,"blurb":125},"Android (Google)","GrapheneOS","Hardened, de-googled Android — ideal for Pixel devices in business use",{"microsoft":127,"openSource":128,"blurb":129},"Exchange ActiveSync","Nextcloud Mobile","Calendar, contacts and files via DAVx⁵",{"title":131,"icon":132,"note":133,"pairs":134},"IT Infrastructure","i-lucide-server-cog","Proxmox is the most-used open-source virtualization platform in Europe and the foundation of my infrastructure setups.",[135,139,142,146],{"microsoft":136,"openSource":137,"blurb":138},"Hyper-V / Azure VM","Proxmox VE","Virtualization platform for your own servers",{"microsoft":140,"openSource":48,"blurb":141},"Azure Active Directory","Identity & access management, SSO, LDAP",{"microsoft":143,"openSource":144,"blurb":145},"VPN (Azure)","WireGuard","Modern, lightweight VPN protocol",{"microsoft":147,"openSource":148,"blurb":149},"Windows Defender Firewall","OPNsense","Open-source firewall and router",{"title":151,"icon":152,"note":153,"pairs":154},"Business, ERP & Online Shop","i-lucide-store","ERPNext is 100% open source. Shop, inventory and accounting run in one system — no sync, no integration upkeep, no vendor holds the keys.",[155,159,163],{"microsoft":156,"openSource":157,"blurb":158},"Dynamics 365 / JTL / Shopify","ERPNext (Frappe)","Inventory, accounting, purchasing and production in one system",{"microsoft":160,"openSource":161,"blurb":162},"Proprietary Webshop","Nuxt + ERPNext API","Headless storefront — catalog, cart and checkout share the warehouse database",{"microsoft":164,"openSource":165,"blurb":166},"SharePoint (Documents)","Paperless-ngx","Document management with OCR and tagging",{"title":168,"icon":169,"note":170,"pairs":171},"Security & Backup","i-lucide-shield-check","Vaultwarden runs on any small server and fully replaces expensive password-manager subscriptions.",[172,176,180],{"microsoft":173,"openSource":174,"blurb":175},"1Password / LastPass","Vaultwarden","Self-hosted password manager (Bitwarden-compatible)",{"microsoft":177,"openSource":178,"blurb":179},"Azure Backup","Restic + BorgBackup","Encrypted, deduplicated backups",{"microsoft":181,"openSource":182,"blurb":183},"Microsoft Defender","CrowdSec","Collective threat intelligence and IP reputation",{"title":185,"lead":186,"benchmark":187,"breakdown":191,"total":201,"payback":202},"Costs in comparison","A typical SME with 20 staff pays around €280/month for Microsoft 365 Business Premium (as of 2025). The comparable open-source stack is an order of magnitude cheaper.",{"label":188,"total":189,"note":190},"Microsoft 365 Business Premium · 20 users","~€280/month","License cost without premium add-ons",[192,195,198],{"label":193,"value":194},"Hetzner servers (2× CX21)","~€12/month",{"label":196,"value":197},"Hetzner storage","~€9/month",{"label":199,"value":200},"Backup","~€2/month","~€23/month","One-off migration cost typically pays back within 6–12 months.",{"title":204,"description":205,"links":206},"Ready to switch?","I guide you step by step – from the first assessment to training your team.",[207,210],{"label":208,"to":209},"Free first call","/pricing",{"label":211,"to":212,"variant":213},"Migration guide","/docs/getting-started/migration-fahrplan","subtle","Your photos, files, chats and passwords belong to you – not to Apple, Google or Microsoft. I'll show you which free software replaces what, and set it up for you.","md",{"links":217},[218,222],{"label":219,"to":220,"trailing":221},"Write to me","/contact?subject=Switching",true,{"label":223,"to":212,"variant":213,"color":224},"Switching step by step","neutral","And for businesses, law firms and practices that want to switch completely – here's the full toolbox that replaces Microsoft 365, Windows & co. All open source, hosted in Germany, controlled by you.",{},"/en/open-source-stack",{"title":22,"description":229,"phases":230,"note":251},"From the first call to the Microsoft licence cancellation — in five realistic phases.",[231,235,239,243,247],{"phase":232,"duration":233,"focus":234},"Analysis","1–4 weeks","Inventory, risk assessment, scheduling",{"phase":236,"duration":237,"focus":238},"Infrastructure","1–3 weeks","Proxmox, Keycloak, Mailbox.org setup",{"phase":240,"duration":241,"focus":242},"Collaboration","2–4 weeks","Nextcloud, Matrix/Element, ONLYOFFICE",{"phase":244,"duration":245,"focus":246},"Workplaces","2–6 weeks","Linux, ONLYOFFICE, training",{"phase":248,"duration":249,"focus":250},"Wrap-up","1–2 weeks","Stabilisation, Microsoft licence cancellation","Our [migration guide](/docs/getting-started/migration-fahrplan) describes the full process in depth.",{"title":253,"description":254},"Open source instead of iCloud, WhatsApp & co. – how switching works","Your own cloud instead of iCloud, your own chat instead of WhatsApp, a password vault instead of password notes – which open-source software replaces what and how switching works.","en/6.open-source-stack",{"headline":257,"title":258,"description":259,"items":260},"Open source instead of …","Yours instead of theirs","For almost everything you use from big providers today, there's a free alternative that belongs to you.",[261,265,269,274,279,284],{"product":262,"instead":263,"description":264,"icon":64},"Cloud","iCloud, Google Drive & OneDrive","Photos, files, calendars and contacts – on your own server in Germany.",{"product":266,"instead":267,"description":268,"icon":85},"Chat","WhatsApp & Teams","Encrypted messaging and calls – with family, team or clients.",{"product":270,"instead":271,"description":272,"icon":273},"Passwords","Password notes & browser storage","One master password, all others safe in the vault – on every device.","i-lucide-key-round",{"product":275,"instead":276,"description":277,"icon":278},"Shop","Shopify & WooCommerce","Your online shop with inventory management, without monthly platform fees.","i-lucide-shopping-bag",{"product":280,"instead":281,"description":282,"icon":283},"Smart Home","Cloud-based smart home","Control lights and heating locally with Home Assistant – no detour through the internet.","i-lucide-house-wifi",{"product":285,"instead":286,"description":287,"icon":288},"AI","Cloud AI chats","An AI running on your own computer, e.g. with Jan – your questions stay with you.","i-lucide-sparkles","6YDnyqqESh1x3g5zpg3MujRsBiguAazfhlv5GkZcxto",1792720363878]