Question Laptop backup location ?

[smalltech]

My understanding is that the backup file should be stored on another hard disk that is different from the disk that you are making the backup from.

1. My Windows 10 laptop has only one hard disk (C drive), so where are you supposed to store your backup files?

2. Can I plug in a small USB flash disk thumb drive into a USB-A port permanently and store scheduled backup files on it?

Thanks