FTP and SMB/AFP: Backing up to other computers or NAS boxes on your network or in remote locations (say, your parent’s house) is another way of physically safeguarding your data with an offsite, or at least physically discrete copy. FTP can be used for offsite, while SMB (Windows and most OS’s) and AFP (Apple) are good for other PCs or NAS on your local network.
Jihosoft 4K Video Downloader is available as a completely free system that actually works for both PC and Mac users, but there’s a paid version as well. What’s really great about this YouTube video downloader is that it actually works for just about any kind of video you want to download, whether that video comes from Facebook, Instagram, Twitter, SoundCloud, or YouTube, so you’re not stuck with just one platform. You’re also going to have the option to download in just about any resolution and still get all the audio and subtitles that usually come with the video. On top of all that, you can convert to any video format or even MP3 audio, so you’re always able to watch (or listen).
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.
Another problem many people run into with not downloading videos is that they often forget how they got there in the first place. You might forget the title or who posted the video or even some of the key features. That makes it difficult to find the video again in the future. When it comes to downloading those videos, however, you won’t have to worry about that because you’ll have the videos you like to watch available right there. You won’t have to worry about how you’re going to track it down later on because you’ll have it in whatever folder you want with a name that means something to you.
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Some services go above and beyond, including extra capabilities that improve the experience. For example, a few offer disk courier services for bulk uploads and restores via an external drive that the company ships and manages. A couple of these services throw in a local backup component, too. If you go that route, you should take a look at our roundup of best external hard drives. Some of these services can even track your device's location and let you remotely wipe it in case it's lost or stolen.
Reliability: Generally speaking, data centers are backed up to the hilt. Some of the larger ones even back up to different geographical locations. Availability (hopefully 24/7) can also be important. Check for news of outages and the vendor’s own service blogs. If there are too many outages in service, buy accordingly. In truth, all the services we’re aware of are near-100-percent reliable.