Originally posted by another user
1.) If i back up my iPod before restoring, would i be able to restore it after jailbreaking ??
If you mean restoring as going back to another FW or something? Before you restore(right after you JB actually) The first two things you should do is back up your SHSH Blobs using either Cydia(make my life easier) or using a program for your PC known as tinyumbrella. After words install openSSH.
Now if you mean restoring back, as in like re-syncing. Yes you should be able to sync back all of your music, pictures, settings and, videos, or anything else. Now some apps might not want to re-sync now that you've jailbroken your iPod in which case go to cydia and search for appsync and install that. If you want to back up any packages(cydia apps and the JB like) then install AptBackup as that will allow you to sync them with iTunes I believe.
One last thing I find useful is CyDelete, allows you delete packages; springboard apps from cydia, that normally you couldn't delete unless you restore.