ok thanks
Note that a single "one-time" backup is probably not sufficient for keeping your bitcoins safe. You should consider backing up on a regular schedule, and keeping the last several backups. That way if a recent backup is bad/damaged, you'll have a slightly older backup you can revert to.
How often that "regular" schedule should be depends a lot on your usage patterns. In general, I'd suggest being aware of both how many transactions you send and how many addresses you create. Anytime the sum of transactions sent plus addresses created is around 25, I'd suggest creating another backup.