This is for you In case you want to keep multiple backups of Taskers config.
Each time you save the config by pressing the Menu button and choosing Profile Data -> Backup your config will be backed up to Tasker/userbackup.xml on the SD card. This task will detect each new backup, zip it, and rename the zip so that it contains the current date and time.
The number of backups will only be limited by the free space on your SD card. You have to delete them manually in case you don't want to keep them any longer.
See the attached file above.