Windows 7 and Windows 10 have approximately equal resource requirements. The main difference between them is that Windows 10 does more caching and is more optimized for having large amounts of RAM, so it will run faster on a more modern machine.

Is Windows 10 Resource hungry?

Windows 10 is really resource intensive.

Can you upgrade Windows 7 to Windows 10 without losing data?

You can upgrade a device running Windows 7 to Windows 10 without losing your files and erasing everything on the hard drive using the in-place upgrade option. You can quickly perform this task with the Microsoft Media Creation Tool, which is available for Windows 7 and Windows 8.1.