XDA Developers on MSN

My favorite alternative to Obsidian Sync isn't Google Drive or Dropbox, it's something I control entirely

Syncthing is a godsend for Obsidian vaults ...
The Windows Club

Seafile: Free self-hosted file sync and share software

Seafile is a free open source, cross-platform, file-hosting software that can be used to store files on a central server & sync them with other PCs & mobile devices. If you’re looking for free hosting ...