Update Azure Data Lake Storage backup support matrix

Clarified backup support details for Azure Data Lake Storage, including SFTP and container restoration limitations.

Author: Daya-Patil

articles/backup/azure-data-lake-storage-backup-support-matrix.md

@@ -62,6 +62,9 @@ Azure Data Lake Storage protection has the following supported and unsupported s
 - You can protect the storage account with the vault in another subscription but in the same region as storage account.
 - Archive tier for vault is currently not supported.
 - Azure Data Lake Storage accounts support both Blob and Data File System (DFS) APIs. The system captures operations through Change Feed and uses directory snapshots to ensure consistent recovery.
+- SFTP-enabled accounts are not supported for backup. Backup jobs may stall if SFTP-uploaded blobs encountered.
+- $web container cannot be restored as $web on the target. Use the renameTo option and restore it with a different container name.
+- $root container can be restored as $root on the target only if $root does not already exist there. If it already exists, use the renameTo option and restore it with a different container name.
 
 ## Backup limits
 
@@ -108,4 +111,4 @@ The following table lists the restore method limits:
 
 ## Related content
 
-[Access tiers for blob data](/azure/storage/blobs/access-tiers-overview).
+[Access tiers for blob data](/azure/storage/blobs/access-tiers-overview).