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Oh the beauty of convenience.
If you worry about properly backing up all your files and syncing those on your computer, mobile device or server, then you need a service like Dropbox. The service is also super efficient in that it only sends the parts of files that have changed when doing a backup, which can save on bandwidth, especially since the service does backups and syncing in real-time.
If you inadvertently delete a file you can also use Dropbox to restore that file or any version of it that was previously stored on Dropbox. The one drawback of the service is the limited storage capacity for free accounts. Free account holders have only 2GB of storage, but need to pay $10/mo to get 50GB of storage or $20/mo for 100GB. There is a way to increase your storage capacity from 2GB to 8GB by referring your friends to the service. You get 250MB bonus for every person that you refer to the service.