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Furthermore, reMarkable doesn't actually sync anything. You can download files from the cloud but it's a one-way, user-initiated thing

I dunno, it seems to sync your notebooks back up to the cloud & other devices pretty well.

It’s £3/month after the first year, but it still syncs. https://remarkable.com/store/connect

Sorry, you're right in terms of their own cloud. I meant the syncing with Google Drive, Dropbox, etc, which is quite limited