What folders should I backup to my computer I have a SGS2 with ICS. The phone is rooted. I use Titanium Backup Pro for backup, but that only backups to the phone itself, so if the phone is stolen or lost those backups are gone as well. 

I have SSHDroid installed, and yesterday I made a backup of the sdcard folder to my home server using rsync. Now I would like to know if there are other folders that have data in them that I miss. I don't necessarily need a full backup of the phone, don't know if that's useful. I just want all user data safe. 

So is there something that I'm missing? If so, what folders should I backup as well?
Your SD card contains pretty much all the data you need.

In addition to app backup, you can also use SMS Backup+ to backup your texts to the SD card (and then to the home server).

Titanium Backup Pro version has an option to backup files to your Dropbox folder, so you can use that instead of rsync if you like.

Also, try to move as much data to the cloud as you can - including contacts, settings, photos etc - you get peace of mind knowing that most things are already backed up even if your phone gets damaged or stolen.