You can automate creation of event log backup batch from Event Log Explorer.
To export Event Log Explorer computers tree to the backup batch, select Tree->Export to backup batch from Event Log Explorer main menu.
Backup folder - type the name of the destination folder or /NOBACKUP options.
In the Computers box, select the computer names which logs will be backed up, then select log names to backup.
Clear logs after backup adds /CLEAR option to Backup batch lines - this will force ELBACK.EXE to clear event logs after backup.
Review Backup batch and press Save button to save batch to file.