Syncthing is a self hosted is decentralized and continuous file synchronization program. Anyone can set it up and use it!
You don’t need a centralized cloud, nor a server to use it. All you need is to install syncthing on as many devices as you want including android
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You can manually authorize your devices and and setup folders, which files to sync or exclude. It’s powerfull and easy to use.
Do you use proprietary systems which sell your data?
How do you synchronize your files? If you’re a normal person you probably use cloud services (dropbox, google drive, etc) But these are proprietary systems and you don’t own your data plus they will train AI models with all your data and could delete your data at any time.
Self Hosted Alternatives
The next step in selfhosting is to use solutions like owncloud/nextcloud or more lightweight solutions like filebrowser .
These are all great, but still require setting up a server and are geared towards people who want to go into technical stuff.
Easy sync with Syncthing
The neat thing about syncthing is that it’s almost zero config, you don’t need a server and it works.
You can have an at home PC or even a raspberryPI which you can keep running from time to time to synchronize data between your devices and/or .
I still use FileBrowser when I want to share files with others.