You can sync Obsidian with your own storage location. There are plugins to do a lot of what you’re asking for. Downside is that it’s not open source, though your content is all stored in plaintext so you won’t lose it due to lock-in. It also might be more than your asking for and a simpler, more tailored, solution may be out there. Paired with a self hosted Nextcloud server, you may solve a bunch of your PIM needs at once.