I second syncthing. I use obsidian. They want a fee to sync. I use syncthing for free. Obsidian is synced across a personal Linux laptop, personal Windows laptop, desktop, tablet, cell phone, and office laptop. Works well. I also use it to sync working files. I can leave my laptop in the office and still have convenient access from home.
Emails? Emails? I don’t need no stinkin’ emails.
Apologies to treasure of the sierra madres.