Unplanned backups result in waste. There is a structure and process to backup and that requires a lot of planning. Moving from local to cloud backup systems demands greater planning.
First, there is a tradeoff. There is a tradeoff of local bandwidth for network bandwidth. The data no longer resides on the local system and must be requested for and obtained over a network. So, latency issues loom large and must be consciously tackled, understood, and planned for.
Storage contention is another issue that demands attention. Users who enjoyed uncontested right over their local stores will suddenly find themselves queuing up for information. There is no dedicated disk drive and even the large number of storage controllers and larger caches cannot disguise the fact that there is a difference in the type and speed of access that is now available to the end user. A good understanding of cache usage may help you determine storage contention issues and even mitigate them for your users.
Storage bandwidth over-subscription is widespread. Though expensive, it is considered desirable in circumstances where volume of bandwidth usage cannot be predicted. When infrastructure is shared in a cloud by design, there is a constant danger that there will be bandwidth choking due to heavy usage of bandwidth. Planning for bandwidth and planning for over-subscription on bandwidth are imperatives for meaningful backups and restores. This type of planning will help define monitoring parameters and lay the foundation for cost effective usage of shared networks, prioritization on traffic and seamless upgrade of infrastructure with growing volumes.
Finally, free space discovery in the cloud is CPU intensive. The drive is shared and exclusive and if users are not allocated space or the user exceeds the allocated storage space, there can be a major problem for the administrator and the user. Granular level planning on space allocation per user and constant monitoring of space usage will necessarily cut down on problems of this kind.
From the above discussion, it is evident that backup and storage planning requires a deep attention to the structure and process of storage if the backup is to be meaningful and useful. The right questions must be asked and answered before the structure or the process of backup is defined and the plan is executed.