What the... I was under the impression that iCloud backups are end-to-end encrypted. This is a HUGE problem.
You should look into the 'borg' backup tool - it has become the de facto standard for remote backups because it does everything that rsync does (efficient, changes only backups) but also produces strongly encrypted remote backup sets that only you have a key to ... your cloud provider has no access to the data. The borg website is here: https://borgbackup.readthedocs.io/en/stable/ and a good description of how it wor…
For linux servers, borg is great, and me and my companies are happy users.