BackBlaze doesn't have an offline component, so you'll have to handle that yourself, but it's by far one of the most affordable options on the market. Accounts are $5/mo (you get a break if you pay up front for one or two years), and you can add more computers to the same account for another $5/mo. You can read more about Backblaze's pricing options here.
Two ways to back up a channel. So one is the way that I do it is to just put all the videos on an external hard drive after I’ve uploaded them to this channel or my other channels and just double my external hard drive. And an external hard drive also backs up to an online backup account I have at, which I love. I’ve tried other ones and they’re absolutely my favorite. Put a link to them in the description below. If you want to use them it’s like $50 for the year for unlimited storage on the cloud. It’s awesome.

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You just install the downloaded software, and then you put the URL into the link and click to download. It’s that simple, and you’ll be able to get started listening and watching your favorite videos again in no time, and without having to get online again. That makes it great for when you’re traveling anywhere where you won’t have an internet connection for a long period of time. For those who haven’t used a YouTube channel downloader before, this one is going to make it super simple, and you’ll wonder why you haven’t done it before.