Backup Config

Hello,

i have SRX gateways & switches.

i have a management & monitoring system that execute scripts to devices, i want to ccreate a script that do the following:

save xxx
exit
start shell
tftp 10.240.60.100
put xxx

i have to assign the file name instead of xxx, my question which keyword or serverd syntax to the device can use its hostname and the current date time for the filename?

thanks