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#Difference between snapshot and mailist install#If admins try to use a backup software that requires the system to install an agent on the guest OS, they should address potential performance or resource needs.īecause the virtualization layer sits between the guest OS and the physical hardware, the agent must go through the software layer to obtain VM data, which can result in unnecessary resource use. ![]() Backups aren't dependent on other files, including the original virtual disk, which provides a more reliable VM protection option.īefore admins use VM backups, they must be aware that established backup methods often handle VMs inefficiently. Placing backups in a separate storage location makes it possible to isolate backups from the primary VM that can protect against natural disasters and cyberattacks. If the primary VM fails, the system retrieves the backup from the storage repository and restores the VM to the backup creation time and date.Īdmins can store their VM backups on a variety of media types, including tape drives and the cloud, which lowers storage costs. Once the tool stores a VM backup, it remains isolated from the original VM and has no effect on primary VM operations. The backup software might also use data compression or deduplication to back up a VM. Backup software, such as Veeam's Backup & Replication software and Veritas' NetBackup tool, copies a VM at specific intervals and moves those copies to another storage location. VM backups are exact copies of a VM that the system stores separately from primary VM files. What are VM backups and when should admins use them? Snapshots also let admins restore a VM in the event of a cyberattack. #Difference between snapshot and mailist driver#They make it easy to restore a VM to a point in time prior to a software upgrade, a patch release, new application deployment, configuration changes, driver installation or test runs. Snapshots are useful for development and testing purposes. Admins can't use snapshots to recover individual files they must restore a snapshot in its entirety because the system deletes any files from previous snapshots. The system can't restore a snapshot if a previous snapshot file or the original virtual disk is corrupted or unavailable. As a result, it isn't practical to retain snapshots for any significant length of time, which makes them ineffective for long-term data protection.Īdmins must also reconstruct snapshots to restore a VM. The longer a system retains and accumulates snapshots, the more disk space admins lose. ![]() They can quickly accumulate and take up valuable disk space, which can harm performance. #Difference between snapshot and mailist download#Admins don't need to wait for backup files to download from another location because the system can store snapshots alongside existing VM files.īut snapshots come with several challenges. Snapshot files are space-efficient because the system stores them as delta files and not exact VM replicas. Admins can then combine a specific snapshot with any archived snapshots and the original virtual disk to restore a VM. This process automatically occurs and provides a chain of connected delta files. For each VM, snapshots provide restore points that roll back a VM to when the system created the snapshot.Ī system creates snapshots as incremental delta files - or change logs - that track any changes made since the previous snapshot. VM snapshots enable admins to preserve VM data, such as files, configurations, memory and power settings at a specific point in time. What are VM snapshots and when should admins use them? The main distinction between backups and snapshots is that backups are independent, self-contained files that don't require cross-file dependencies to restore a VM, whereas snapshots rely on dependent files for VM restoration. Backups store VM data as a direct copy in a separate location, such as the cloud, which enables admins to restore the original VM for disaster recovery (DR) purposes. Admins can't use snapshots as backups because snapshots rely on delta files to temporarily store VM data locally. VM snapshots and backups both retain VM data, but they satisfy different use cases. ![]()
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