Exam SY0-501 topic 1 question 94 discussion

The question was cost-effective (reduces cost). Differentials are more costly. Also, for a "file" server incrementals are backed up from last incremental. In a differential, these back ups only looks at the last full backup. It's more costly.

The answer is not A, you can take a snapshot of that individual vm's its current state, but for an entire file server, the most cost efficient way is incremental. The answer is incremental.

The question is not asking about which back up is cheaper. Instead it is saying to minimize the cost the company choose virtual operation. Don't miss the point any time when it comes to virtual backup, snapshot is the best options

File-level backup answer is snapshot because the question is about vm When you take a file-level backup, the virtual server will again have a snapshot taken of it, but this time the volumes within the virtual machine (VM) are discovered and mounted to the staging area. A file-level backup allows you to restore individual files and folders to a staging area. Or, with a backup agent installed in the virtual server, you will in most cases be able to restore directly back into the server.

This is what I'm reading from Meyers' supporting A: A snapshot stores a version of an operating system (including applications) at a given moment in time. These are common for individual system backups, such as System Recovery Snapshots in Windows and Time Machine backups in macOS. For servers and such, a snapshot as a backup refers to the powerful feature with virtual machines that enables you to save a version of a functional VM to restore very quickly if anything negative happens to the functional server. A company DNS server might run on a virtual machine, for example. If that server gets corrupted or compromised, rather than restoring it from backup, you could simply delete the image and load a clean snapshot.

as its a file server, it presumably will have frequent changes and updates, so anything a snapshot or full backup wouldn't be suitable on their own. You would want frequent incremental backups so you can restore to an hour ago, rather than last night or Sundays full backup

File sever means FTP server . The right answer is Incremental backup because the company will take a backup when ever some change happen to the file sever . Snapshot is wrong because it will need to a lot of storage to save it and this is not a cost efficient .

Image- Takes a bit-level copy of a disk or partition. Individual files are not examined, so all data is copied regardless of the archive bit. A snapshot is an example of an image. Everything I have studied points to snapshot.

From the Comptia website <https://www.comptia.org/content/guides/comptia-quick-start-guide-to-business-continuity-and-data-recovery>: When selecting virtualization for disaster recovery and business continuity, there are different options for backing those systems up. Though there are many options when backing up a Virtual Machine, there are typically two options that work the best. Image level backups is one option in using backup software/appliance that will backup the VM Image. Remember that a VM is simply a large file that is changed at the block level, just like a document. To reduce the time and size of the backup, a second option is available called block level incremental backups. This methodology allows a full image backup initially, then any block level changes. This also allows for data deduplication as well. There are systems that now enable a recovery of a VM in under 5 minutes. So, either A or C. I agree that a snapshot is not really a backup (even though Comptia may consider it that way), so I'd go with C (Incremental).

Snapshot is not a backup, that leaves for other three options (full, incremental, and differential) “Full” is costly, “Differential” is costly compared to “incremental” due to the nature of them.

snapshots are good for client VMs. But a file server? still gotta back up the files.

snapshots should only be used in a temporary testing situation. They should not be used for backups as they will continue to increase in size as long as they are retained and data changes.

This question is a little tricky, but I think the writer maybe being tricky intentionally. I think MelvinJohn has it right with Server over data, so C and D are out and we have A and B left. I work for a large enterprise and we do use snapshots, but only for quick rollbacks should a Change Request fail. Otherwise we use Avamar to do nightly full VM backups. However, Avamar also uses snapshots to accomplish this (it literally talks with vCentre). So I think Snapshots is the winner if the question is vm oriented.

A. Question asks " Which of the following types of backups would be MOST appropriate for the particular file server?" it's not asking to backup the files - it's asking to backup the server itself. Snapshots provide that. The snapshots are wrirtten to a SAN, and the SAN backups are best performed using incrementals. But the question isn't asking for that.

When it comes to quick rollbacks, snapshots on virtual machines are a quick and effective way to roll back to a point in time. Especially when it comes to development environments, VM snapshots are a great way to return to a known point in time. However, many mistakenly view snapshots as a type of "backup" since it allows the return back to a known good point in time. It is dangerous to consider snapshots on a virtual machine to be a type of backup.

A Snapshot will revert the state of a virtual machine but since most of VMs implementations specially with file servers, host all data on a separate disk, the snapshot will be useless.

Snapshot Backup A snapshot backup captures the data at a moment in time. It is commonly used with virtual machines and sometimes referred to as a checkpoint. Chapter 1, “Mastering Security Basics,” discusses virtual machines (VMs) and administrators often take a snapshot of a VM before a risky operation such as an update. If the update causes problems, it’s relatively easy to revert the VM to the state it was in before the update You can perform an Incremental till after a full backup has been completed. this quest is extremely poor