[G Tablet General] enigma0456:
Let me begin by stating that I am not an expert. What I am about to relate are my own experiences today. They may help answer some questions and raise others. Hopefully someone that knows more than me will jump in and add to this.

I loved my g-tab when I got it and reloaded it with tnt-lite. I was sad when I reflashed it to try vegan and all my apps were gone. This isn't necessary but I had no idea what I was doing in any orderly sense of the word. Since then there has been a great post with simple steps on how to flash a rom. http://xdaforums.com/showthread.php?t=1016695 I happened to see the Woot announcement and jumped on it to get a second tablet to experiment with so I wouldn't mess up my original once I had gotten it to just where I wanted it (that too was probably not necessary as you will soon read).

Out of the box I setup the gtab and then installed the ota update to bring it up to current specs. Next I installed ClockworkMod and re-partioned he tab as described in the post cited above. Next I made a backup using ClockworkMod so I had a full backup of the original system. These got stored in a folder ClockworkMod/Backup (and it seems they have to be here if you want to restore them). Being a cautious kind of guy, I made a copy of the folder on my SDcard2. Also, being perhaps a bit more cautious, I plugged in the usb and copied the same folder to my PC for good measure.

Now, I made a folder on the g-tab called INSTALLS (you can call it whatever you want) and copied the various rom zip files into it. I also copied clemsyns newest kernel there for use with Calkulins 1.1 rom. I also copied Calkulin's Format-All zip file here as well http://xdaforums.com/showthread.php?t=985705&highlight=calkulin's+rom

Initially, I was using ClockworkMod to wipe the partitions but it appears to me that Calkulin's FormatAll can do it all at once (correct me if I'm wrong) so I switched to using that.

So - Reboot, hold down the power and volume+ keys to start ClockworkMod. Click over to install zip from sdcard. Click to choose zip from sdcard. Browse to your INSTALL directory and there are all the zip files. Right now mine has tnt_lite_v4.40/, Calkulin's FORMAT_ALL.zip, Calkulin's_G-Tab_ROM_v1.1.zip, ClemsynFROYOVersion9.zip,gtab.VEGAn.1.00.beta5.1.user.final.zip and gtab.VEGAn.1.00.beta5.11.supp.zip

Select Calkulin's FORMAT_ALL and it reformats "critical" partitions. Once it finishes, come back here and choose a ROM to install. For the sake of discussion, choose the first - tnt_lite_v4.40/ Once it finishes installing, reboot and there you are with tntlite4.40. You'll still have to do the market fix as described in the installation instructions cited in the beginning of this post.

Now get it all set up the way you like, play around, etc. and then do this. Boot up to ClockworkMod and make a backup. When it is done you can boot back up into tnt_lite or whatever ROM you've installed. Use a file explorer and you'll find the clockworkmod folder and inside you will find a folder named backup and inside is your backup. I copied it to my SDCard2 and also to my PC for safe keeping.

Now you can rinse and repeat as needed for all the other roms you want to try. So format, install rom, configure it then back it up with Clockwork Mod. When you've done all the roms you want you can just restore any one you feel like using. Remember - you are restoring from the clockworkmod/backup folder, not the INSTALL folder. Also, the names of the backups are like datestamps so write down which is which if you have several. I have a little text file in the directory that I update to keep track of which is which.

It seems pretty simple and perhaps there is something I've missed but so far I've installed, backed up and restored several roms and this has worked without a hitch. Oh - the backups seem to have checksums or something because a backup of one g-tab won't restore on another.

I hope this helps some of you that are playing around like I am without a full understanding of how everything works but still determined to try stuff. Again, anyone with more information and knowledge to add, please leave your comments.