I know folk are selling this idea but it has big issues that can't be solved by "picking the right one."
I have 2 terabytes of hard drive (2 one terabyte hard drives) and my computer isn't that old. I can't use the backup system that came with windows 7 because Dell sent me the computer with both drives on C drive with very little room on D drive. I took it into a computer shop in Canada, and all they did was take my money.
I would like to backup my system on a regular basis on an outside source( a company that sells you space for backups) . I know they used to have these type of things and if they still do could you please recommend a reputable company I could use.