Incremental backup requires the previous full backup plus all incremental backups, making it the slowest to restore. Differential backup requires the previous full backup plus a single differential backup, making it faster than incremental but slower than full. Full backup restores are the fastest.

Huawei OceanStor NAS systems provide a comprehensive Audit Log feature to track user activities for security and compliance purposes. This feature records metadata related to how files and directories are accessed and manipulated over the SMB or NFS protocols.
According to the Huawei technical reference, the audit mechanism captures a wide range of events, including:
File Opening (Option D): Records when a user accesses a file, including the timestamp and user ID.
File Modification (Option B): Tracks changes made to the content of a file.
File Renaming (Option A) and Deletion (Option C): Records structural changes to the file system, which is critical for identifying potential data theft or accidental loss.
By analyzing these logs, administrators can reconstruct the history of file operations to determine "who did what and when." This is a key component of Huawei's data security framework, helping organizations meet internal auditing requirements and external regulatory standards.

The new-generation high-end OceanStor hybrid flash models improve reliability by enabling active-active SAN deployment, supporting high-density snapshots for enhanced data protection, and using SmartMatrix 3.0 to tolerate failures of up to seven out of eight controllers.