When we speak of backing up we mean making a copy from one device to another. It's no use making a folderol your C drive and copying there because if your hard drive fails you will likely lose the original and the backup. Is ckearkt you want to backup to a different device.
That device might be local. For example backing up to a plugged-in external drive. Or it might br remote (in the cloud). The cloud simply means a device somewhere other than your location. And by device with probably mean a bank of hard drives or many banks of hard drives.
LOCAL:
A bit of history. The Norton company once had a product called Ghost. It would make a clone of your hard drive for the purposes of backup. Currently there is a friendly product called Casper which does the same thing. Do you see the connection?
Here is a list of some of the many backup products:
• Casper
• Acronis True Image
• Easus (several products)
• Backup Pro
There are many others.
CLOUD-BASED:
• Backblaze
• Carbonite
• iDrive
There are others.
The point of all of this is you should be backing up.