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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]
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.
A disk image is a snapshot of a storage device's structure and data typically stored in one or more computer files on another storage device. [1] [2]Traditionally, disk images were bit-by-bit copies of every sector on a hard disk often created for digital forensic purposes, but it is now common to only copy allocated data to reduce storage space.
Veeam backup server – a Windows-based physical or virtual machine where Veeam Backup & Replication is installed. It is the core component responsible for all types of administrative activities in a backup infrastructure, including general orchestration of backup, restore and replication tasks, job scheduling and resource allocation .
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 ...
A snapshot indicates that a committed file(s) is stored in its entirety—usually compressed. A changeset , in this context, indicates that a committed file(s) is stored in the form of a difference between either the previous version or the next.
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.