What are some alternatives?
When comparing IDrive and TeraCopy, you can also consider the following products
Google Drive - Access and sync your files anywhere
Robocopy - Robocopy is a free file copy tool that is included with the Microsoft Windows operating system. It allows one to construct complicated instructions to move, or copy files.
Backblaze - Backblaze's remote backup automatically backs up your data to our secure datacenter.
Ultracopier - SuperCopier replaces Windows explorer file copy and adds many features: Transfer resuming, transfer...
Dropbox - Online Sync and File Sharing
FastCopy - FastCopy is the fastest copy, delete, & sync software on Windows.