How do you backup?

I haven't figured this out yet... how do you backup all your photos?

Solution 1: Get it on external hard drives they are so cheap now. Problem solved. good bye.

Solution 2: Throw it up on the cloud. Problem solved. good bye.

Solution 3: Make some CDs. (Not going to spend hours and hours for that, won't consider)

1) Yes, external hard drives are so spacious and cheap now. But they don't last forever, yes they will probably last at least a few good years. Now how can I have some redundancy, like copy everything from drive 1 onto drive 2. Good old

diskcopy a: b: 

from DOS? My Windows 10's Explorer won't even honor cross drive copying if your folder is more than a Gig or so. (It will just not respond to the drag). But it is cumbersome to have to keep copying as you get more things on drive 1 to want to duplicate in drive 2. There are external drive cloners like you plug in two hard disks (like Atari cartridges) and clone ... but is there anything that duplicates USB external drives? The world needs a device that offers 2 usb slots, a button, and boom, duplicate it for me. (Haven't found this yet)

2) Everyone offers you free storage on the cloud. Google Drive, Microsoft One Drive, dropbox, etc. But it is just a few gigs. You need at least a few hundred gigs if you have a few years of photos. The cost isn't that high but still is some money. See https://www.cnet.com/how-to/onedrive-dropbox-google-drive-and-box-which-cloud-storage-service-is-right-for-you/.

But some may not be comfortable to put all your private photos on the web. There are various backup tools out there to automatically sync your computer to the cloud... again, putting everything you have on the cloud? But all at a cost... there are some free tools but I am afraid of malware.

How do you backup your stuff?