In addition, although its a good idea to disable Quiescing for database server to avoid problems, it would be better to consider enabling it for VMs which does not run databases to get a better consistency. I am sure double take had implemented away to enable & disable that as needed & might even automanted that.

Though this get more relevant when you interact with VCB. As vRanger offer the ability to backup VM images using VCB which provide you with a LAN-free backup, then you will have to interact with the VMware filesystem sync driver. Though as Double Take does not offer VCB integration & LAN-Free backup this part of the article is irrelevant. Although of the extra work required to integrate vRanger with VCB, it get to be a nice feature with an enterprise environment with a large amount of data.

Furthermore, the problem with Quiescing is not vRanger problem, but a “filesystem sync driver” problem which is a part of the VMware tools. Please note understanding when to use Quiescing & VSS as explained in the article is very important when backing up Virtual Machines using any backup solution. As the problem does not always occur & the backup software will not alert you to any problem when you backup, the problem only will be detected when trying to restore. In the database restore case, you might end up restoring a consistent file, but inconsistent database. I hope that help a bit clearing it up.