What are some alternatives?
When comparing IDrive and rsync, you can also consider the following products
Google Drive - Access and sync your files anywhere
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
FreeFileSync - Download the latest FreeFileSync 10.4. FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
Dropbox - Online Sync and File Sharing
GoodSync - GoodSync provides highly reliable file backup and synchronization for both individuals and businesses.