Merge pull request #107905 from roygara/descUp

Adding new description, image, and alt text

Author: v-albemi

includes/media/virtual-machines-disks-incremental-snapshots-description/incremental-snapshot-diagram.png

@@ -14,4 +14,6 @@ Incremental snapshots are point in time backups for managed disks that, when tak
 
 There are a few differences between an incremental snapshot and a regular snapshot. Incremental snapshots will always use standard HDDs storage, irrespective of the storage type of the disk, whereas regular snapshots can use premium SSDs. If you are using regular snapshots on Premium Storage to scale up VM deployments, we recommend you use custom images on standard storage in the [Shared Image Gallery](../articles/virtual-machines/linux/shared-image-galleries.md). It will help you achieve a more massive scale with lower cost. Additionally, incremental snapshots potentially offer better reliability with [zone-redundant storage](../articles/storage/common/storage-redundancy-zrs.md) (ZRS). If ZRS is available in the selected region, an incremental snapshot will use ZRS automatically. If ZRS is not available in the region, then the snapshot will default to [locally-redundant storage](../articles/storage/common/storage-redundancy-lrs.md) (LRS). You can override this behavior and select one manually but, we do not recommend that.
 
-Incremental snapshots also offer a differential capability, only available to managed disks. They enable you to get the changes between two incremental snapshots of the same managed disks, down to the block level. You can use this capability to reduce your data footprint when copying snapshots across regions.
+Incremental snapshots also offer a differential capability, only available to managed disks. They enable you to get the changes between two incremental snapshots of the same managed disks, down to the block level. You can use this capability to reduce your data footprint when copying snapshots across regions.  For example, you can download the first incremental snapshot as a base blob in another region. For the subsequent incremental snapshots, you can copy only the changes since the last snapshot to the base blob. After copying the changes, you can take snapshots on the base blob that represent your point in time backup of the disk in another region. You can restore your disk either from the base blob or from a snapshot on the base blob in another region.
+
+:::image type="content" source="media/virtual-machines-disks-incremental-snapshots-description/incremental-snapshot-diagram.png" alt-text="Diagram depicting incremental snapshots copied across regions. Snapshots make various API calls until eventually forming page blobs per each snapshot.":::

includes/virtual-machines-disks-incremental-snapshots-description.md

@@ -26,16 +26,16 @@ To create and configure incremental snapshots in the global Azure portal, you mu
 1. Sign into the [Azure portal](https://aka.ms/incrementalsnapshots) with the provided link and navigate to the disk you'd like to snapshot.
 1. On your disk, select **Create a Snapshot**
 
-    :::image type="content" source="media/virtual-machines-disks-incremental-snapshots-portal/create-snapshot-button-incremental.png" alt-text=" ":::
+    :::image type="content" source="media/virtual-machines-disks-incremental-snapshots-portal/create-snapshot-button-incremental.png" alt-text="Screenshot. Your disk's blade, with **+Create snapshot** highlighted, as that is what you must select.":::
 
 1. Select the resource group you'd like to use and enter a name.
 1. Select **Incremental** and select **Review + Create**
 
-    :::image type="content" source="media/virtual-machines-disks-incremental-snapshots-portal/incremental-snapshot-create-snapshot-blade.png" alt-text=" ":::
+    :::image type="content" source="media/virtual-machines-disks-incremental-snapshots-portal/incremental-snapshot-create-snapshot-blade.png" alt-text="Screenshot. Create a snapshot blade, fill in the name and select incremental, then create your snapshot.":::
 
 1. Select **Create**
 
-    :::image type="content" source="media/virtual-machines-disks-incremental-snapshots-portal/create-incremental-snapshot-validation.png" alt-text=" ":::
+    :::image type="content" source="media/virtual-machines-disks-incremental-snapshots-portal/create-incremental-snapshot-validation.png" alt-text="Screenshot. Validation page for your snapshot, confirm your selections then create the snapshot.":::
 
 ## Next steps