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The author shares their personal experience setting up a free backup storage system using Linux and Syncthing, implementing the 3-2-1 backup technique to sync files across multiple devices.
BasicSync is a simple Android app that runs Syncthing as a background service, with controls for network/battery conditions and support for external storage.
A complete configuration guide for free Syncthing sync of Obsidian that has been tested and passed, covering installation on Mac and Android, device interconnection, folder sharing, and lessons learned to avoid pitfalls.