BC/DR

Zerto vs. vSphere Replication: Which DR Strategy is for You?

Posted on Oct 1, 2016 Updated on Mar 13, 2026

When it comes to Disaster Recovery (DR) in a VMware environment, there are two names that always come up: vSphere Replication (VR) and Zerto.

One is often “free” (included in most licenses), while the other is a premium enterprise powerhouse. But in 2026, with the shifts in Broadcom’s licensing and the rise of ransomware, the choice isn’t just about price—it’s about how much data you can afford to lose.

The Contenders

1. vSphere Replication (The Built-in Basic)

vSphere Replication is a hypervisor-based, asynchronous replication engine. It’s integrated directly into vCenter and captures changed blocks to send to a target site.

Best For: Small to medium businesses with “relaxed” recovery goals.
Cost: Included with vSphere Standard and vSphere Foundation subscriptions.

2. Zerto (The Gold Standard for CDP)

Zerto uses Continuous Data Protection (CDP). Instead of taking snapshots, it uses a lightweight agent on each host to intercept every write in real-time and stream it to the DR site.

Best For: Mission-critical apps where losing 15 minutes of data is a catastrophe.
Cost: Licensed per VM (Premium pricing).

Key Comparison: RPO and RTO

In the world of “Lazy Adminning,” we care most about RPO (Recovery Point Objective – how much data we lose) and RTO (Recovery Time Objective – how fast we get back up).

Feature	vSphere Replication	Zerto (HPE)
Replication Method	Snapshot-based (Asynchronous)	Journal-based (CDP)
Best RPO	5 to 15 Minutes	5 to 10 Seconds
Point-in-Time Recovery	Limited (up to 24 instances)	Granular (Any second within 30 days)
Orchestration	Requires VMware Site Recovery Manager (SRM)	Built-in (One-click failover)
Snapshots	Uses VM Snapshots (can impact performance)	No Snapshots (Zero impact on IOPS)

Why Choose vSphere Replication?

If you have a limited budget and your management is okay with losing 30 minutes of data, VR is the way to go.

Pros: It’s already there. No extra software to install besides the appliance. It works well for low-change workloads.
Cons: It relies on snapshots, which can cause “stun” on high-load SQL servers. Without adding SRM (Site Recovery Manager), failover is a manual, painful process of registering VMs and fixing IPs.

Why Choose Zerto?

If you are running a 24/7 shop or protecting against Ransomware, Zerto is king.

Pros: The Journal is a time machine. If ransomware hits at 10:05:30 AM, you can failover to 10:05:25 AM. It also handles IP re-addressing and boot ordering natively.
Cons: It’s an expensive add-on. It also requires a “Virtual Replication Appliance” (VRA) on every host in your cluster, which uses a bit of RAM and CPU.

The Verdict: Which one is “Lazy”?

vSphere Replication is lazy at the start (easy to turn on), but high-effort during an actual disaster (lots of manual work).
Zerto is a bit more work to set up but is the ultimate “Lazy Admin” tool during a disaster—you literally click one button, walk away, and grab a coffee while the entire data center boots itself at the DR site.

This entry was posted in VMware, Zerto and tagged BC/DR, CDP, Disaster Recovery, LazyAdmin, Ransomware Recovery, RPO, RTO, Site Recovery Manager, SRM, VMware, vSphere Replication, Zerto.

ZCP Study Guide: Zerto Certified Professional Exam Q&A

Posted on May 24, 2016 Updated on Mar 13, 2026

Ready to become a Master of Disaster? If you are preparing for the Zerto Certified Professional (ZCP) exam, you know that understanding the nuances of Continuous Data Protection (CDP) is key.

Below is a quick-reference study guide based on the core competencies of the Zerto 4.5+ curriculum. We’ve highlighted the correct answers to help you review.

ZCP Practice Exam Questions

1) After performing a failover operation (Test, Live, Move) Zerto allows you to generate a report detailing the steps performed during the operation.

True
False

2) VPGs can only protect virtual machines running Mac OS X or Windows XP and newer.

True
False (Note: Zerto is generally OS-agnostic as it operates at the hypervisor replication level.)

3) To recover a single VPG after a corrupted database, which of these operations would be most effective?

Journal file-level restore
Offsite clone
Live failover
Backup restore

4) ZVR’s Journal is stored where?

Production/source site
Recovery/target site
Both
Neither

5) During a VPG sync, which of the following operations can be performed? (Select all that apply)

Add a VM to the group
Remove a VM from the group
Change length of Journal history for the group
Change hard limit of Journal size for the group

6) Offsite Backups for a VPG should be scheduled to run at least every four hours, but no more than every 12 hours.

True
False

7) How much memory can be allocated to a Virtual Replication Appliance (VRA)?

1 GB
3 GB
Between 1-16 GB
Between 2-8 GB

8) If both sites (target/recovery and source/production) are up, healthy, and accessible, which VPG-level operation is most appropriate?

Live Failover
Move/migration
Offsite Clone
JFLR

9) What basic method does ZVR use to protect data and applications?

VM-level continuous replication
Scheduled and on-demand snapshots
Daily delta syncs
Guest/agent-based replication

10) ZVR cannot function across different hypervisors, storage configurations, or host OS versions.

True
False (Note: Cross-replication between VMware and Hyper-V is a core Zerto strength.)

11) What must be true for a Move operation to be effective? (Select all that apply)

Both source (or production) and target (recovery) sites are up and accessible
Each VM in the VPG has an up-to-date Journal
The very latest copy of the data is required
One of the site’s hosts has either a new VRA installed or an upgraded VRA

12) A fully configured ZVM on each paired site—e.g. production and recovery—requires which of the following? (Select all that apply)

Adding a site-specific license under Site Settings
Creating matching VPGs on each site
Installing VRAs on that site’s host(s)

13) Enabling auto-commit will always provide 30 minutes to validate the results of a failover before committing the changes.

True
False (Note: The timeout is configurable.)

14) ZVR has built-in support for scheduled bandwidth throttling that can work with or without other hardware/software also managing this.

True
False

15) What characterizes the kinds of VMs you should group together in the same VPG?

Each are using the same datastore or volume for storage
They need to maintain consistency with each other and all be failed over or recovered together
All are running both the same OS and same hypervisor
The journal is sized the same on each VM

16) Adding a VM to an existing VPG means… (Select all that apply)

The entire VPG will be re-synchronized to ensure group consistency
The VPG protection will need to be paused before adding the additional VM
A checkpoint will be automatically inserted in the Journal prior to adding the VM
A Live Failover cannot be executed until the updated VPG is fully synchronized

17) What is the Journal?

Audit trail to track which operations were performed and when
Series of checkpoints tracking block-level changes within VMs
Detailed list of every snapshot, whether automatic or manually generated snapshots
Compliance record of each VPG’s replication status at any given checkpoint

18) The ZVR installer includes which of the following components? (Select all that apply)

Local copies of the ZVR documentation specific to your hypervisor
One license key for each site you’ll use with Zerto
Microsoft .NET Framework in case the machine does not already have it installed
VRA template for a custom-designed Zerto VM
A Virtual Backup Appliance (VBA) for managing backups

19) If you needed to test the failover of an entire virtualized datacenter, what best practices should be followed? (Select all that apply)

Perform the test during off hours or on the weekend
Clone the VPGs you want to test prior to starting the failover test
Use an isolated/fenced network for testing
Always stop the test from within ZVM and not your hypervisor’s management console(s)
Provision a sandbox where ZVR can deploy the test VMs

20) What is a Virtual Replication Appliance (VRA)?

Lightweight agent installed on each VM in a protection group
Snapshot engine that powers the ZVR Journal
Custom Linux VM performing continuous replication
A hypervisor plugin/add-on to manage cross-hypervisor replication

21) ZVR 4.5 allows for Journal Compression to increase storage capacity for journal history.

True
False

22) If the hypervisor service/admin account provided during installation is incorrect, ZVR will still proceed with the installation and ask for re-validation after installation is complete.