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Syncthing is everything. We've fully replaced Google Drive and Dropbox with it. It just works, and it's perfect.
There's no central server, you can have as many shared folders as you want wherever you want... and it's basically two-way trust, you share a folder from device and the receiving device must accept it.
I have Syncthing on my NAS (as well as every computer I have) and I backup my NAS. I don't need to be perfect at this... Syncthing means any one of my devices need survive... the NAS isn't the only copy. But I use rsync once a month onto a HDD which I store outside of the house.
Syncthing looks interesting, I'm guessing it works nicely. Google drive has caused me a fair amount of pain over the years.
What do you use for backups? I've a feeling you've covered this before, do you manage them yourself? I currently use backblaze, I don't trust myself to manage backups.
Also interested in fastmail, privacy aside I'm just a bit tired of Gmail.