The move towards the cloud is making it easier to get all of your data on all of your devices with little to no effort.
For the purpose of getting your contacts, calendars, bookmarks, reading lists, reminders, and notes on all of your devices, Apple's iCloud just works, as advertised. This has at least always just worked for me...so far.
I have completely switched my devices over to iCloud to let it manage this data, but I have been nervous ever since I turned it on. The fear is that I may wake up one day, open my contacts and there is nothing there. The same goes for all of the personal data I listed above.
All of these items could be manually backed up, but that would be time consuming and most likely something that you would easily forget to do.
It would be nice if Apple allowed users the ability to automatically download backups of these databases with the flip of a toggle switch. Having the ability to download a backup of this data, and allow it to save two or three revisions of that database would definitely make me feel more at ease with having my data in iCloud.
Even if Apple had been successful with all of it's attempts at online services, which everyone knows they have not, I would still be as leery with fully trusting that they would be able to protect this data forever.
For now I will just have to set reminders, and hopefully not be too busy to follow the process to manually back this data up so that I could restore it in the future if need be.