How does Windows Server Backup 2012 R2 handle full backups on multiple storage disks

I would like to configure two removable storage medias in Windows Server Backup on Windows 2012 R2 server. The purpose would be to keep one media off-site.
I have read the following article "Configure a Backup Schedule for Multiple Storage Disks"
In it it states, "A message informs you that any one of the disks that you selected may be chosen to store the first backup. Click OK ."
My concern would be if the first backup, the full backup, was on Media A then Media B would contain only incremental data and would not allow a full restore.
Does anyone know if WSB knows that a new media is attached and it needs to create a Full backup? Does it create a new Full each time a different media is connected? I would think it would have to.

Thanks for any help with this.
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This information is a tad misleading (not purposefully).  Windows Server Backup will only do incremental (differential) backups on storage disks that contain an existing full backup.  In other words, the first backup to a disk is a *essentially* a full backup, each backup from that point is an incremental (differential).Capture.JPGSource

Since they are block level backups differential is based on the differences in the blocks.

This also provides a good overview:

Cliff GaliherCommented:
Yes, each disk is self contained and has no dependence on other disks for restore. This means windows will create a full backup as necessary depending on what media is the target for backup.
noxchoGlobal Support CoordinatorCommented:
In short: if there is no full backup found on the media it will be created automatically. If there is already full backup then it will proceed with differential backup (increment). WSB is clever enough in this case..

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Gerald ConnollyCommented:
Incremental - Backups changes since last backup, be that a Full or an incremental

Differential - Backups changes since last FULL backup
CanOfWormsAuthor Commented:
Thank you for the answers. Just what I was looking for.
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