Apologies for quality but have no photoediting software on this PC

I will try to enclose a screen shot of the Macrium front page. How can I clone the last two PC drives to the two partitions on the portable drive in addition to the successful clone of drive C. When I try to clone drive E on the PC to drive H on the portable drive, I receive a warning that drive G on the portable drive will be overwritten.

I successfully cloned drive C on the PC to drive G on the external portable drive. I partitioned the portable drive into three new drives, designated G, H and I and fully formatted all three. I wanted to clone all three drives to a high capacity 2 terabyte Western Digital portable hard drive to make a bootable backup that could install my PC set up exactly as now should the PC fail, either onto the same PC if a failed component were replaced, or on a new PC if the present one was replaced. The second drive, drive E has flight simulation software installed on it, and the third drive F has scenery files that load onto the flight sim. The portable hard drive is too small to store them all.I have a Windows 10 PC containing three SATA hard drives: drive C for the Windows operating system plus downloads, documents etc. I use Carbonite to back up all these images to cloud storage. I periodically cut and paste all these different system images onto the secondary HD, to make sure I have a backup of all those computers, in case of a catastrophic failure on any of them. At home, I have a desktop computer that has an internal secondary 3 TB physical hard drive, aside from the main physical hard drive. I have a portable 200 GB hard drive that I travel with for temporarily storing system backup images of these computers, using Macrium Reflect Free. I have around 15 computers that I have scattered all over the city that I maintain for several friends and relatives. I have a question about storing the Macrium Reflect images.

Macrium reflect portable