Will Audit Data Be Lost If I Change Instance Specifications or Upgrade a CBH Instance?

In normal cases, the audit data will not be lost when you change specifications of a CBH instance or upgrade the system of a CBH system.

Back up data before changing specifications of a CBH instance or upgrading a CBH instance to prevent data loss in case such operations fail.

Before specifications change
Data must be backed up before you change CBH specifications. For details, see How Do I Back Up Data in a CBH System Before Upgrading the System Version?

Ensure that the current CBH system is version 3.2.16.0 or later if you want to change specifications to professional editions. Otherwise, the enhanced functions remain unavailable after specification change. If the CBH system version is earlier than 3.2.16.0, upgrade the system version first. For details about how to view the CBH system version, see About System.
During specification change
It takes about 30 minutes for the instance specifications to be changed. During this period, the CBH system is unavailable, but services running on the managed hosts are not affected. To avoid data loss, do not log in to the CBH instance for any operations during this period.
After specification change
Only the data disk specifications are changed. The system disk specifications are not affected. The CBH system changes the CPU, memory, and bandwidth for you, which does not affect the use of the original EIP.

Before the upgrade
Back up CBH system data to prevent the upgrade failure from affecting services.
During the upgrade
The version upgrade takes about 30 minutes. Although the CBH system is unavailable during this period, there is no impacts on host resources managed on the instance. However, to prevent important data loss, you are not advised to log in to the CBH system during the version upgrade.
After the upgrade
The CBH instance automatically restarts after the upgrade completes. You can then use the mapped CBH system.

After the upgrade, you can use the configuration and storage data of the original CBH system. Version upgrading does not affect the original configuration and storage data of the CBH system.