The best part of Carbonite is the ease in setup. It is super quick and simple to install and setup. Basically does it all for you with default settings, which will backup all your common storage folders. You will want to have a look into the settings to add other folders you want to be backed up, or remove some if you do not wish to backup that folder...such as your Downloads.
The worse part of Carbonite, is the very slow, snail-speeds while downloading files. If you ever have to restore a file or system, just be ready to wait a day, or five, before it finishes. This is not due to your internet connection, it is Carbonite not allocating enough bandwidth to download stuff fast.
For example - for 56gb of data off a server I had to restore, it took (LITERALLY) 4 days...nearly went over to the 5th day. I complained severely to them, with no sympathy or concern - they simply did not care. It is their policy and they will stick to it. If you know your downtime from the time data is lost to the time you restore it, must be less than a week, then Carbonite is simply not a viable option.
I recommend you consider wisely before settling on Carbonite. The reasons are the super slow speeds with restoring data and the fact that they just removed the ability to backup pictures and videos from your mobile devices. This was one of the best features of Carbonite and without it, it has demoted itself down to the same playing field as Dropbox, Microsoft OneDrive and others. With this change, one must concern themselves with what other changes Carbonite may make in the future that will reduce the quality of their offering.
No problems. The simple point of having a backup is to ensure you never need it. If you are depending on your backup for anything, than you are doing many things wrong. A backup is the last option, when all else has already failed to restore the data. Therefore, Carbonite is not solving any problems - simply providing the solution necessary to ensure stability and dependability of the integrity of your data. And the benefits...are none. The slow speeds simply make this a decent option for your needs of having redundant backups.