I've had luck with backblaze.  I've never had to do a full restore from it though.  If you don't have upload speed Dropbox is probably your best bet; the incremental solutions eat bandwidth like candy.

I used to like Dropbox because I could use it to stream music in playroom. I still use it but it has too little space so Google drive is OK. Right now i use degoo, which gives you 100 gigs of free space for free, and you can unlock more by watching ads. They only ask that you check in at least once every year i think, in order for you to keep your files. Of course you can subscribe for more perks as well.

I use backblaze, myself. For servers I use tarsnap.

@6
For servers I'd suggest getting onto a provider that can do scheduled snapshots and calling it a day, if you can.

To be honest I have been toying with keybase at least for a public and semi private share with 250gb of storage.
Its not a complete backup but good for an on demand share.
The catch is while it appears its fine on the mac, the windows client is a total fucking mess with unlabeled buttons and links.
I like the idea of keybase being an online file system.
But yeah, even though I have unlimited bandwidth, who knows.
I am still in the market for something that will backup, ie, a software that will.
1.  do a full system backup to a drive of a drive and maybe select user folders on another drive and keep each updated on every incert of that drive.
Obviously it needs to track things somehow.
Or modify a already setup drive with data with stuff from the drives and folders I put into it.
I need this for a workstation which has a data drive and some other folders on the system drive used by my dad.
It needs to be simple, secure and low cost.
I have the drives so yeah.
I need it to be accessible from the point of view that if it needs to track and monitor things, I will want to have ways to control it, ie, if I am doing admin things for example for system files I may want to pause it, turn it off, etc, especially if I download and delte temperary downloads etc.
I need it to be usable by the sighted and blind and I need it not to use massive performance. while its working and idoling.
Obviously there will be some, however I have had times in the past where the system uses so much power it crashes out the entire system and after I get a sightling to varify its complete I need to reboot the system completely to get it to work.
I have also had some of those fluffy hard drive manufacturer backup programs while  they did do what they did, used all resorses just simply running.
I had to uninstall all of it, clear its data then reformat just  to get rid of all the space filling junk it put in windows.
It wasted a lot of time and made the system almost unusable while doing so.
I want something to just work.
Oh and if it does all this I need  it to be secure, I don't want someone able to lift the backup database and read it or anything.

@crashmaster, I've also toyed with Keybase, but the Windows client just made me turn my head, and since Windows is my only computer OS, well...
@MyDearWatson, Lucky. My school set us up GSuite accounts, but I don't want to use my school account for non-school reasons as I'm pretty sure admins can just see what's in there, that or they could just log into my account, or something like that. Either way, I'd like not to find out.

I use the dropbox 2 tb, it used to be 1 tb, plan.

I don't need more at the moment and if I do, I can always turn as much of my audio into MP3s as I can.

Yeah, I guess OneDrive will serve me good for a long time more. Like 15, I don't think I'll fill up all that space for a while, but it's nice to have for sure.

I use Google Drive. Though it seems to be a secure way to store data, I backup my email letters on my hard drive. There are many great tools that allow doing this, but I like Email Detail Archive the most. It is super fast and simple and helps me to make copies of my letters as PDF files. Moreover, it is convenient to have all the necessary email letters on my computer as I can work even when there is no Internet connection.

I use Keybase, because I don't want to pay for extra storage. I already have a 4 tb external drive, and plus my local drive is only 256 gb, so there wouldn't be much point in paying for google drive or dropbox. I'm no where near the 256 mark. But I'm glad Keybase is a network drive, as not only does it give me an additional 250, but for my friends it is the easiest way for us to transfer data, as we don't have to worry about people's space limits. Well, eventually we may if we add enough, but it will take awhile. I was previously using a 70 gb local drive, so you can see how big of a difference this is for me lol.

Usually, I use Google Drive free 15GB, and Dubox free for 1TB

I just use Onedrive since I have 5 tb of it, I also have unlimited Google drive with the Team drive thing, but I don't like it so I am holding onto Microsoft, it is fast, easy to manage and easy to share stuff.