After I promised in Unionfs thread as an example to tinker even a cool plugin that you can thus start with the unionfs, here is the thread for the plugin based on it freeze.

The following features the Freeze plug-in:

1) Transparent extension of the flash with USB Stick / CF card / HDD

There is therefore no longer necessary or difficulty with links
Case mounts to outsource to other devices, or a complete multi-boot system to install. Simply a device to Freezing to the Flash image and already is plenty of room in gefreezten Flash (which is then also spared, as only read-only genountet).

2) freezing of an Image object

After having established its image as you want it, you can freeze it, and enhancements, changes, things that you installed to then go only to a freeze delta directory (which may on CF / USB / HDD or flash even if his can depending on which device is on the installation of the box this is selected autimatisch, erase, and with a new look with other automatic device to the box but also adapt to the)) - there is still plenty of room.

3) Roll Back of Images

When has gefreezt 2) the image and then you installed something that destroys the image or do not like you can easily return to the frozen state, without making tedious backups before and they repair a broken.

4) Umswitchen the image of a Unionfs

In the 7025 is the default anyway, but in the 800/8000 you can then flash with the unionctl command at any time with other file systems / Directories expand merge, etc.-this is the functionality of the unionfs-boot tool kits from the unionfs Thread - this is no longer necessary.

5) re-sync the image

If one is with adjustments, software updates, new plugins that have been made with a gefreezten image, this can be satisfied again from the back to the original image freeze delta directory. And then of course you can freezen this state again :-)

6) Check the File System Devices Freeze

PS: If those who do not know Mr. Freeze, then the film Batman & Robin to recommend the 1997, with Arnold Schwarzenegger as Mr. Freeze. And I hope no one complaining again the plugin title would be too subtle.

PPS: And the freeze device must be formatted in ext3, FAT or NTFS is NOT!