Best cloud storage service? Sys & App configuration file backup???

Hi. I'm not sure I'm posting in the correct forum, but I just bought a Dell laptop (Latitude E6420) and I'm the process of setting it up ... installing applications, transferring files, etc..

I want to use one of the online storage cloud services (Carbonite, DropBox, etc.). I have never used one before. I see a lot of reviews with pros & cons, but none of the reviews I have found seem to address my major concern. Which one of these services backs up system configuration files and application configuration files? I know they all backup data files.

I've had hard disks die on me before. After re-installing the operating system (Windows) and the applications, I found that all those little "tweeks" that I've done over years to customize my operating system and my applications are gone. I have the data files (spreadsheets, docs, etc.), but I now have to go and re-configure my computer. Since I don't keep a written record of every change I made to the operating system and to applications this is not an easy thing to do.

I want to use one of the cloud base services, but it's not clear which ones backup those configuration files for the system and for the applications I am using. I know they all backup my data files. Very important, but not sufficient. If my disk crashes, when I do a restore from the cloud backup service I want my computer back to the way it was working and configured before the crash.

Any recommendations?

Thanks,

- Simon