Anyone using a good proton drive alternative?

I run Synology NAS at home and I love it, but it was expensive to set up.

Other extreme is Syncthing for completely free device sync, but no backup beyond your devices and both devices must be online to sync.

I self-hosted Nextcloud on cloudamo with Cryptomator for e2ee but I can’t really recommend it. Nextcloud is pain to administer and tends to be buggy.