Just pull it up on your computer, that would be the easiest way to manage your sdcard.
Remember, pics/videos and apps to sdcard are big space takers...
Nandroid backups, I normally only keep 2 or 3 on there...
1. Untouched setup of whatever based ROM I'm running before modifying anything.
2. Backup of my current setup, all tweaked out and setup how I like it.
3. Maybe an old backup of a previous ROM that I may bounce back to from time to time.