Syncthing VPS Docker Hosting

Syncthing is a continuous, open-source file synchronization program that keeps files identical across two or more devices in real time. It is peer-to-peer and decentralized, so your data syncs directly between your own devices over encrypted connections and is never stored on a third-party cloud server. It covers private folder sync across laptops, phones, NAS boxes, and servers, file versioning for recovery, send-only and receive-only folders, and encrypted untrusted peers for safe off-site replicas.

Syncthing is very light on resources. It is written in Go, ships as a single binary, and runs happily on low-power hardware like a Raspberry Pi or a small VPS. CPU use is modest outside of active transfers, and memory use scales mainly with the total number of files being tracked across all folders rather than with the size of those files, so a node syncing many small files needs more RAM than one syncing a few large ones.

Syncthing uses TCP and UDP port 22000 for the actual sync protocol between peers, UDP port 21027 for local network discovery, and TCP port 8384 for the web GUI. On a VPS you open 22000 in the firewall so other devices can connect to the always-on node, and the GUI on 8384 is normally placed behind an HTTPS reverse proxy such as NGINX rather than exposed directly to the internet.

Syncthing needs very little RAM for typical use. A node syncing a modest number of files runs comfortably in a few hundred megabytes, which is why it is popular on Raspberry Pis and small servers. Memory grows with the total file count across all synced folders because Syncthing keeps an index of every file, so a deployment tracking hundreds of thousands of files wants 1 to 2 GB of RAM, while smaller setups need far less.

No. Syncthing is peer-to-peer and decentralized, so your files are only ever stored on the devices you choose to sync them to and are transferred directly between those devices over encrypted connections. There is no central Syncthing cloud, and the project's optional discovery and relay servers only help peers find and connect to each other — they never have access to your unencrypted file contents.

Yes. Syncthing is fully free and open source under the Mozilla Public License 2.0, with no paid tiers, seat fees, or capacity limits. There is no commercial edition and no account to create — the whole product is the open-source application, so running it on your own VPS gives you the complete feature set at no license cost.

Yes. Every device has a unique cryptographic device ID, and all traffic between peers is encrypted and mutually authenticated with TLS using the Block Exchange Protocol. Because Syncthing is decentralized with no central server or account, there is no third party that can read your data or single point to compromise. Optional untrusted-device encryption even lets a peer store data it is unable to decrypt, which is ideal for an off-site replica.

Two install paths are common. Run the official syncthing/syncthing Docker image with port 22000 published for sync and 8384 for the GUI, mounting a volume for the synced folders and config, or download the single Syncthing binary for your platform and run it under a service manager such as systemd. After first start, you connect devices by exchanging their device IDs and accepting the shared folders on each side.

Syncthing only syncs two peers when both are online at the same time, so a network of laptops and phones that are frequently asleep or offline can drift out of sync. Running Syncthing on a VPS gives you an always-on node that every other device can reach at any hour, so changes propagate as soon as any one device comes online. The VPS also acts as a reliable, well-connected relay and an off-site replica of your data.

Yes. Syncthing offers per-folder file versioning so that changed or deleted files can be recovered rather than lost. The available strategies are simple versioning (keep a fixed number of old copies), staggered versioning (keep progressively fewer copies as files age), trash-can versioning (move deleted files to a recycle folder), and external versioning (hand files to a custom command). This makes a Syncthing VPS node a practical lightweight backup as well as a sync hub.