Automated backups/revisions of configs on Cisco routers.
http://www.cisco.com/en/US/docs/ios/12_3t/fun/command/reference/cfrgt_01.html#wp1094316
archive
To enter archive configuration mode, use the archive command in global configuration mode.
archive
Syntax Description
This command has no arguments or keywords.
Defaults
No default behavior or values
Command Modes
Global configuration
Command History
|
Release
|
Modification
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|---|---|
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12.3(4)T |
This command was introduced. |
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12.2(25)S |
This command was integrated into Cisco IOS Release 12.2(25)S. |
Examples
The following example shows how to place the router in archive configuration mode:
Router(config)# archive
Router(config-archive)# path disk0:myconfig
Related Commands
archive config
To save a copy of the current running configuration to the Cisco IOS configuration archive, use the archive config command in privileged EXEC mode.
archive config
Syntax Description
This command has no arguments or keywords.
Command Modes
Privileged EXEC
Command History
|
Release
|
Modification
|
|---|---|
|
12.3(7)T |
This command was introduced. |
|
12.2(25)S |
This command was integrated into Cisco IOS Release 12.2(25)S. |
Usage Guidelines
Note 
Before using this command, you must configure the path command in order to specify the location and filename prefix for the files in the Cisco IOS configuration archive.
The Cisco IOS configuration archive is intended to provide a mechanism to store, organize, and manage an archive of Cisco IOS configuration files in order to enhance the configuration rollback capability provided by the configure replace command. Before this feature was introduced, you could save copies of the running configuration using the copy running-config destination-url command, storing the target file either locally or remotely. However, this method lacked any automated file management. On the other hand, the Configuration Replace and Configuration Rollback feature provides the capability to automatically save copies of the running configuration to the Cisco IOS configuration archive. These archived files serve as checkpoint configuration references and can be used by the configure replace command to revert to previous configuration states.
The archive config command allows you to save Cisco IOS configurations in the configuration archive using a standard location and filename prefix that is automatically appended with an incremental version number (and optional timestamp) as each consecutive file is saved. This functionality provides a means for consistent identification of saved Cisco IOS configuration files. You can specify how many versions of the running configuration will be kept in the archive. After the maximum number of files has been saved in the archive, the oldest file will be automatically deleted when the next, most recent file is saved. The show archive command displays information for all configuration files saved in the Cisco IOS configuration archive.
Examples
The following example shows how to save the current running configuration to the Cisco IOS configuration archive using the archive config command. Before using the archive config command, you must configure the path command in order to specify the location and filename prefix for the files in the Cisco IOS configuration archive. In this example, the location and filename prefix is specified as disk0:myconfig as follows:
Router# configure terminal
Router(config)# archive
Router(config-archive)# path disk0:myconfig
You then save the current running configuration in the configuration archive as follows:
Router# archive config
The show archive command displays information on the files saved in the configuration archive as shown in the following sample output:
Router# show archive
There are currently 1 archive configurations saved.
The next archive file will be named disk0:myconfig-2
Archive # Name
0
1 disk0:myconfig-1 <- Most Recent
2
3
4
5
6
7
8
9
10