Руководство Пользователя для Cisco Cisco Content Security Management Appliance M160

During a full initial backup, a backup of 800GB may take up to 10 hours. Daily backups, may take up to 
3 hours each. Weekly and monthly backups may take longer. These numbers may vary. 

After the initial backup, the backup process transfers only files that have changed since the last backup. 
Thus, subsequent backups should take less time than the initial backup. The time required for subsequent 
backups depends on the amount of data accumulated, how many files have changed, and to what extent 
the files have changed since the last backup. 

Backing up a Security Management appliance copies the active data set from the ‘source’ Security 
Management appliance to a ‘target’ Security Management appliance with minimum disruption on the 
originating ‘source’ appliance. 

The phases of the backup process and their effect on the availability of services are as follows:

Communication 
between 
appliances 

The source and target Security Management appliances must be able to 
communicate using SSH. Therefore: 

Port 22 must be open on both appliances. By default, this port is opened when 
you run the System Setup Wizard. 

The Domain Name Server (DNS) must be able to resolve the host names of both 
appliances using both A records and PTR records. 

Appliance 
capacity 

The capacity of the target appliance must be the same as or greater than the capacity 
of the source appliance. Disk space allocated to each type of data on the target 
appliance cannot be less than the corresponding allocation on the source appliance. 

You can schedule a backup from a larger source to a smaller target Security 
Management appliance as long as there is enough space on the target for all 
of the data being backed up. For example, if the source appliance is an 
M1060 and a smaller M650 is the target, you must reduce the space allocated 
on the larger M1060 to match the space available on the smaller M650 
appliance. See 

 for information on 

allocating disk space. 

Multiple, 
concurrent, and 
chained backups 

Only one backup process can run at a time; a backup that is scheduled to run before 
a previous backup has been completed will be skipped and a warning sent. 

Data from a Security Management appliance can be backed up to a single Security 
Management appliance. 

Chained backup (a backup to a backup) is not supported.