Hey there, Charlie64.
You have plenty of backup applications to choose from, for example you could check out this article: http://www.tomsguide.com/us/pictures-story/633-best-android-backup-apps.html. Other than that you can use your gmail account for the backups (settings -> backup & reset). Most phone manufacturers also feature a tool which could help you backup your stuff (however in most cases your backup goes to a computer instead of the SD card).
Hope that helps. Please let me know how everything goes.
Boogieman_WD