System snapshot

The request system snapshot command allows you to create a copy of the currently running software on another media-for example, a universal serial bus (USB) storage device. The system snapshot feature takes a "snapshot" of the files currently used to run the device-the complete contents of the /config and /var directories, which include the running Juniper Networks Junos operating system (Junos OS), the active configuration, and the rescue configuration-and copies all of these files into an alternate memory source. Typically, this command is used prior to the upgrade of the software image on the dual internal NAND flash device (with the da0s1 or da0s2 slices) or to remedy a bad image, thereby preventing the bad image from rendering the system useless. A snapshot to another media ensures that the device can boot from the other media in case the system does not boot up from the current image.