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Shadow Copy (also known as Volume Snapshot Service, [1] Volume Shadow Copy Service [2] or VSS [2]) is a technology included in Microsoft Windows that can create backup copies or snapshots of computer files or volumes, even when they are in use. It is implemented as a Windows service called the Volume Shadow Copy service.
Near-CDP backup applications use journaling and are typically based on periodic "snapshots", [16] read-only copies of the data frozen at a particular point in time. Near-CDP (except for Apple Time Machine) [17] intent-logs every change on the host system, [18] often by saving byte or block-level differences rather than file-level differences.
Zerto’s simple, software-only solution uses continuous data protection at scale to solve for ransomware resilience, disaster recovery and data mobility across private, public, and hybrid deployments. Zerto supports VMware, Hyper-V, AWS, Microsoft Azure, IBM Cloud, Google Cloud, Oracle Cloud, and more than 350 managed service providers. [8]
To avoid downtime, high-availability systems may instead perform the backup on a snapshot—a read-only copy of the data set frozen at a point in time—and allow applications to continue writing to their data. Most snapshot implementations are efficient and can create snapshots in O(1). In other words, the time and I/O needed to create the ...
Copy-on-write (COW), also called implicit sharing [1] or shadowing, [2] is a resource-management technique [3] used in programming to manage shared data efficiently. Instead of copying data right away when multiple programs use it, the same data is shared between programs until one tries to modify it.
Veeam Backup & Replication operates both the virtualization layer as well manages physical machine backup. It backs up VMs at the image-level using a hypervisor's snapshots to retrieve VM data. [6] Backups can be full (a full copy of VM image) or incremental (saving only the changed blocks of data since the last backup job run). [7]
Traditional backups only restore data from the time the backup was made. True continuous data protection, in contrast to "snapshots", has no backup schedules. [5] When data is written to disk, it is also asynchronously written to a second location, either another computer over the network [6] or an appliance. [7]
Starting with 9.4 ONTAP by default deduplicate data across the active file system and all the snapshots on the volume, saving from snapshot sharing is a magnitude of the number of snapshots, the more snapshots the more savings will be, therefore snapshot sharing gives more savings on SnapMirror destination systems.