Should I buy a NAS drive to back up my laptop?

Adele wants to improve her backup options and has read that NAS devices are her best bet. It ain't necessarily so

I use a 1TB USB hard drive - it's connected to my wifi router - as the main storage for my home laptop and mobile. I don't have a secondary backup and have read that NAS drives are a better option for this. Would this be OK as backup storage? I also have some documents/pictures on OneDrive. Adele

The most important thing to remember about hard drives is that they fail. In fact, the seven-year-old 2TB USB drive I was using to backup my desktop PC failed on Saturday. That wasn't a problem because my PC's hard drive was still fine and I had my 2TB backup backed up to an 8TB USB drive. (The 8TB drive also backs up the backups to two laptops.) On Monday, I replaced the dead drive with a new 4TB USB 3.0 drive, because you can never have too much backup space, and it's really not worth buying anything smaller.