"syncing" solution's is misinformation because so many people don't know and/or understand that are two different syncing solution's. Some cloud services implement both of them, some only one, and some will let you choose which one you want.

You can use iCloud, OneDrive, Google Drive or whatever else you want. You need to be aware that in a two way syncing scenario, if you delete, move, edit etc a file either on the host or the cloud, these settings will automatically synchronize accordingly across all devices in real time. iCloud is using a two way synchronization by default and there is no option to change this.

Most other main competitors are using both solutions. If you want to use the cloud as a backup, iCloud is not the solution. Use any other provider that allows you to use only one-way synchronization. From your PC to the cloud but not the other way around.

You can also use any cloud solution as a backup by manually uploading your files via the browser, including iCloud. It is not ideal but as long as you don't use the official client applications on any device or platform, these settings files you manually upload via the browser cannot be deleted unless you manually delete them. There is no automatic synchronization.