Comparison of different Replication setup environment

July 21, 2025

Here is a comparison of the setup concerns on different replication environment.

Type of connection

This is the type of connection with the Backup Server, for Internet connection, you must be aware of the download speed which may affect the restore performance.

N/A refers to a direct connection with the Backup Server and the replication storage is not located on the same disk as the user home.

Environment	Type of connection
AhsayCBS (Physical machine/Cloud)	Internet LAN
AhsayCBS (Existing VM)	Internet LAN
Cloud (Storage)	Internet
Local	LAN N/A
FTP/SFTP	Internet LAN
Mapped Drive	LAN
Removable Drive	N/A

Cost

The cost is measured in terms of setup, hosting, storage media type and maintenance.

* The cost would be affected if the cloud storage is charged based on bandwidth or amount of access.

Environment	Cost
AhsayCBS (Physical machine/Cloud)	High
AhsayCBS (Existing VM)	Medium
Cloud (Storage)	Medium
Local	Low
FTP/SFTP	Low
Mapped Drive	Low
Removable Drive	Low

Replication Speed

The replication speed over the Internet would mainly depend on the upload bandwidth. The replication speed is similar as file copying between 2 devices and the number of backup set to replicate. If fast replication is required, you can consider using multiple threads replication (v7.7 onwards).

Environment	Replication Speed
AhsayCBS (Physical machine/Cloud)	Medium over Internet Fast over LAN
AhsayCBS (Existing VM)	Medium over Internet Fast over LAN
Cloud (Storage)	Medium over Internet
Local	Fast over LAN and direct connection
FTP/SFTP	Medium over Internet Fast over LAN
Mapped Drive	Fast over LAN
Removable Drive	Fast using direct connection

Recovery Speed

This is measured in terms of the Backup Server downtime. The bottleneck is mainly on the Internet bandwidth.

Environment	Recovery Speed
AhsayCBS (Physical machine/Cloud)	Fast
AhsayCBS (Existing VM)	Fast
Cloud (Storage)	Slow
Local	Fast
FTP/SFTP	Slow over Internet Fast over LAN
Mapped Drive	Fast
Removable Drive	Fast

Switch to Backup Server

Environment	Switch to Backup Server
AhsayCBS (Physical machine/Cloud)	Yes
AhsayCBS (Existing VM)	Yes
Cloud (Storage)	No
Local	No
FTP/SFTP	No
Mapped Drive	No
Removable Drive	No

Time to switch over by DNS

** The speed would depend on the DNS propagation time.

N/A refers to the device has no such capability and not applicable for the DNS switch over.

Environment	Time to switch over by DNS
AhsayCBS (Physical machine/Cloud)	Slow** over Internet Fast over LAN
AhsayCBS (Existing VM)	Slow** over Internet Fast over LAN
Cloud (Storage)	N/A
Local	N/A
FTP/SFTP	N/A
Mapped Drive	N/A
Removable Drive	N/A

Time to switch over by IP address

Switch the IP address of the Replication Server to the IP address of the Backup Server, provided that the Backup Server is down and the IP address will not be used on the Backup Server again.

N/A refers to the device has no such capability and not applicable for the IP switch over.

Environment	Time to switch over by IP address
AhsayCBS (Physical machine/Cloud)	Fast
AhsayCBS (Existing VM)	Fast
Cloud (Storage)	N/A
Local	N/A
FTP/SFTP	N/A
Mapped Drive	N/A
Removable Drive	N/A

Offsite Replication

Environment	Offsite Replication
AhsayCBS (Physical machine/Cloud)	Yes over Internet No over LAN
AhsayCBS (Existing VM)	Yes over Internet No over LAN
Cloud (Storage)	Yes
Local	No
FTP/SFTP	Yes over Internet No over LAN
Mapped Drive	No
Removable Drive	No

Replication Snapshot

*** Depends on the cloud service provider/setup.

Environment	Replication Snapshot
AhsayCBS (Physical machine/Cloud)	By AhsayCBS
AhsayCBS (Existing VM)	By AhsayCBS
Cloud (Storage)	Depends***
Local	No
FTP/SFTP	No
Mapped Drive	No
Removable Drive	No