Create a Full Backup, and in doing so, just follow all the Defaults, do not make a Password (just something else to go wrong/forget). It is really quite easy. I make full backups, as and when I have made any changes/additions to my hardware and/or software. Do not bother with Incrementials or Differentials, if any one of those gets corrupted in any way, then that whole process will be useless. Usually done fortnightly, keeping the last two backups on my External drive, and deleting the oldest one each time I add a new backup.
You will only need to make a Clone if/when you wish to upgrade your hard-drive to a larger capacity drive, this is what the Clone option is intended for.