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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.
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]
VM-aware storage has some similarities to and can benefit from software-defined networking, but is distinct in that the latter provides general purpose physical equipment that can be customized and configured in software whereas VM-aware storage is designed for virtual machines.
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.
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 ...
Plan 9's Fossil file system can provide a similar feature, taking periodic snapshots (often hourly) and making them available in /n/snap. Fossil can forever archive a snapshot into Venti (usually one snapshot each day) and make them available in /n/dump. If multiple changes are made to a file during the interval between snapshots, only the most ...
VMware vRealize Suite – a cloud management platform purpose-built for a hybrid cloud. VMware vRealize Hyperic was acquired from SpringSource [144] and subsequently discontinued in 2020. [145] VMware Go is a web-based service to guide users of any expertise level through the installation and configuration of VMware vSphere Hypervisor. [146]
A virtual machine (VM) can be more easily controlled and inspected from a remote site than a physical machine, and the configuration of a VM is more flexible. This is very useful in kernel development and for teaching operating system courses, including running legacy operating systems that do not support modern hardware.