Have you ever used rsync with encfs? I found that combo fits quite a few use cases for backups w/ encryption. Personally, I only use that locally. I don't sync to cloud services with encfs, but just getting on to another local drive on the LAN via cron is great.
Discussion
Yes, both - but oddly never in unison! Thank you!
The security flaws are a feature in this case (the encrypted file is identical each time, so it can facilitate incremental remote syncs, as you probably know). One thing I should add from experience: if you happen to try this, don't get fancy on the algorithm. There are incompatibilities with macOS at some levels, so test it. I do hub/spoke one-way, so there is little risk (my GNU/Linux box is the hub. I've been doing this over 15 years and never lost data.