The number one reason to download the entire YouTube channel is that you’re going to have offline access to them. If you want to catch up on your favorite shows but you’re going to be without internet for a while you may want to have a way to do it without the internet. Being able to get access wherever you happen to be, directly on your device, is going to be an important step. It’s going to make sure that you have something to do during that time that you’re away from internet access or not wanting to use your internet access (which is another great reason).
File backup: If you want to back up only your data (operating systems and programs can be reinstalled, though it’s mildly time- and effort-consuming), a program that backs up just the files you select is a major time-saver. Some programs automatically select the appropriate files if you use the Windows library folders (Documents, Photos, Videos, etc.).
One of the biggest advantages of using an online backup service is that it lets you access your files from anywhere. Most online backup providers let you view and download files from a web browser, but that should be the bare minimum. Many also include file-sharing options, the best of which even let you specify a password for access and an expiration date for the shared item.