If you have ever had a computer fail (and who hasn't) you know the importance of having your files backed up. I for one am really bad at remembering to back up my files on a regular basis so automated backup is a necessity for me. I recently found out that files on my computer are shared on a Microsoft cloud server. called OneDrive. Microsoft will give you 5 G of storage for free, but over that they will want you to pay for it monthly ($20 per year for 100 GB). In contrast, a cheap external hard drive costs less than $20 at a place like Walmart. Now, the cheap laptop I use has solid state drive with 250 G capacity. If you do not like the idea of all your information and files being on someone else's cloud, consider backing up your computer to an external drive. You can buy 250 G of solid state memory for $60. I got a 500 GB solid state drive out of a dead laptop. I got an adapter to convert to usb-c, which allowed me to access the files from the computer. You can get one like it for like $12.
Here is a YouTube video showing how to set up the drive to automatically backup your files. The video demonstrating use of a program called FreeFileSync that can be downloaded from here.