What Is the Difference Between Backup and Replication?


A backup operation stores data of an EVS disk to the local backup storage.

A replication operation copies backups (generated in backup operations, used to restore EVS disk data), and stores the backup copies to the remote backup storage. When the local backups are corrupted, the remote backup copies can be used instead to restore EVS disk data.

Other related questions:
What are the differences between automatic session backup and quick session backup
The differences between quick session backup and automatic session backup are as follows: -In quick session backup, sessions are synchronized to the standby firewall immediately after being set up. In automatic session backup, only sessions that require backup and are detected by the session aging thread are synchronized to the standby firewall. -The quick session backup function can back up half-open TCP sessions and sessions to the firewall. If the forward and return paths are different, enable quick session backup to ensure that the sessions on the two firewalls are the same.

Differences between firewall hot standby and router dual-link backup
The packet forwarding mechanisms are different. For a router, service packets are forwarded packet by packet. The device looks up the routing table and interface-based ACL. Packets are forwarded only if corresponding match is found. After link switchover, subsequent packets are continuously forwarded. Each packet is independently processed. As a stateful firewall, the USG checks only first packets. If first packets are permitted, the USG creates a quintuple session connection accordingly. Then subsequent packets (including returned packets) matching this session entry are permitted. If link switchover occurs, subsequent packets cannot find correct session entries, resulting in service interruption. When NAT is configured for a router, similar problems may occur, because a new entry is created after NAT.

What are the differences between one-click backup and configuration import and export on TE series endpoints?
Differences between one-click backup and configuration import and export are as follows: - One-click backup: A local backup file is created on the endpoint. If some parameters in System Settings are inadvertently deleted or modified, you can use this backup file to restore all parameters in System Settings to the pre-backup state. - Configuration import and export: On the endpoint web interface, you can import the system configuration from or export the system configuration to the local PC. Then, you can use the configuration to configure multiple endpoints in batches or view the configuration on the local PC.

What are the differences among N+0, N+1, and N+N backup modes of power modules
For CE series switches: In N+1 backup mode, N power modules provide power supply, and one power module acts as a backup. If one power module fails, the redundant power module provides power supply to ensure normal operations of the switch. In N+N backup mode, N power modules provide power supply, and N power modules act as backups. Even if all the N primary power modules fail, the N redundant power modules can still ensure normal operations of the switch. In N+0 mode, N power modules provide power supply, and no redundant power module is available. If one power module fails and the total output of the other power modules is smaller than the actual power consumption of the switch, the switch cannot run properly.

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