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2. Shadow Copy - Wikipedia

   en.wikipedia.org/wiki/Shadow_Copy

   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.

3. Veeam Backup & Replication - Wikipedia

   en.wikipedia.org/wiki/Veeam_Backup_&_Replication

   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]

4. Zerto - Wikipedia

   en.wikipedia.org/wiki/Zerto

   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]

5. Copy-on-write - Wikipedia

   en.wikipedia.org/wiki/Copy-on-write

   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.

6. Snapshot (computer storage) - Wikipedia

   en.wikipedia.org/wiki/Snapshot_(computer_storage)

   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 ...

7. Backup - Wikipedia

   en.wikipedia.org/wiki/Backup

   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.

8. Continuous data protection - Wikipedia

   en.wikipedia.org/wiki/Continuous_data_protection

   Since true CDP "backup write operations are executed at the level of the basic input/output system (BIOS) of the microcomputer in such a manner that normal use of the computer is unaffected", [2] true CDP backup must in practice be run in conjunction with a virtual machine [6] [9] or equivalent [10] —ruling it out for ordinary personal backup applications.

9. VMware VMFS - Wikipedia

   en.wikipedia.org/wiki/VMware_VMFS

   VMware VMFS (Virtual Machine File System) is VMware, Inc.'s clustered file system used by the company's flagship server virtualization suite, vSphere. It was developed to store virtual machine disk images, including snapshots. Multiple servers can read/write the same filesystem simultaneously while individual virtual machine files are locked.