It's one of the best tools out there to make a disaster recovery disc or make an ISO of your own customized Ubuntu. It's an equivalent to Windows backup and restore (if you use it only for system recovery and not to recover your personal files).Read more »
Previously some there was some problem for remastering Ubuntu 9.10 (Karmic koala). Karmic Koala is using Grub 2, remastersys is designed for grub 1. Now Remastersys is redesigned for ubuntu 9.10 with grub 2 and it is working. you need Remastersys version 2.0.13-1 or higher.
All other options are just like previous versions.
This tutorial will show you how to remaster your ubuntu 9.04 jaunty using a jaunty iso file.Read more »