Basically an unlimited disk in the cloud. For people who want extra security, tools like
duplicity this can work with Google Drive and Google Cloud Storage to encrypt data locally before sending them.
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Pro Cheap (about $0.01/GB/Month)
Same price a Google Drive, but more flexible as you pay for what you use (Google Drive you have to jump from 100 MB to 1 TB for example). Also supports larger backups.
Pro Optionally supports versioning
Versioning can be enabled at no extra cost so you may retrieve older versions or deleted files.
Pro Works with duplicity
duplicity allows to encrypt data locally using GPG and it supports Google Cloud Storage.
Pro Can be shared with other people
Via the Google Cloud Platform or their CLI tool, you can create publicly accessible URLs to parts of your data.