Here is an interesting discussion about the need for backup with cloud storage.....
The emergence of file sync/share solutions has spurred a debate regarding whether a file sync/share service with versioning capabilities (such as Microsoft’s OneDrive for Business) can replace endpoint backup solutions (such as Storagecraft Shadowprotect). These tools, created for different purposes, have overlapping but distinct functions. However, sync and share tools and enterprise backup tools differ at core, fundamental levels. Both have value, but they are not swappable replacements for one another.
At first glance, file sync and share tools with versioning capabilities (such as Microsoft’s OneDrive for Business) appear to be “good enough” for backup, due to the tools’ innate data protection capabilities. However, they lack adequate data protection; these tools, designed with backup as an afterthought, are more complex and create reliability problems when used in that role.
Sync-and-share, versioning, and endpoint backup solve different business problems, address different requirements, and are managed differently: