The Block count number you have should not be a problem.
Taking some information from The SSD Anthology: Understanding SSDs and New Drives from OCZ
If your SSD has a 20KB block size, that means that there are about about 25,165,824 blocks for a 480GB SDD and thats not including any of the extra storage that some SSD manufactures include. So only haveing 16 bad blocks out all those block does not look like a problem at all, as for a number that would indicate a failing drive, I am not sure what that would be but I can assume that would be the number of extra block the Manufacture provides, once your SSD uses that up, then you start loosing storage capacity.
According to OCZ Product sheet
Vertex 3 2.5” SSD 512GB 480GB VTX3-25SAT3-480G 842024025559
Of Note the 512GB is the Raw Capacity, so it looks like there is 32GB of extra space for block failures, so that works out to about 1,677,721 total extra blocks of storage.
If the drive is causing problems like spinning cursors, slowness or crashes see below for more suggestions.
A possible solution try formatting the SSD 1 more time and try running it with out TRIM enabled or any other 3rd party SSD tools software. See if the drive can work on its own with just a clean install of OS X, with out any weird crashes.
If the drive starts acting up again after the clean install and no 3rd party trim enabler on, it could be that there may be a hardware / software incompatibility between the SATA controller on the Mac and that particular drive. I would try to verify the drive is working OK by placing it in another computer or external hard drive case, etc.
And also try searching around on the web for issues between MacBooks and your particular brand of SSD.
If the drive is acting weird on all testing computers and interfaces, then you would have a confirmed failed drive and would have an evident need of a getting the drive replaced under warranty.
Note: If your having a rough time with the SSD drive it would not be a bad idea contacting OCZ support and explaining to them the issue you are having, they may already have a solution figured out.
If you use Disk Utility to image an HFS filesystem into one dmg file, the resulting file is portable no matter what filesystem you store it on.
Where things get complicated is incremental backups. If you want incremental backups and a DIY solution, choose a sparse disk image and use rsync to update the band files that you store on NTFS, just like Time Machine does to Time Capsule.
If you really just want a painless backup solution, you might select a professional tool set such as (in alphabetical order):
Since I listed some of the more popular incremental backup software packages (some are hosted, some you can self host), the one that seems to fit your requirement the best is the free CrashPlan software that would be self hosted and need a computer connected to the NTFS drive to host the Mac data as a backup destination.
Best Answer
I think this is what you are meaning.
In terminal type in
sudo dd if="/dev/disk0" of="/volumes/<volume>/image.img"Warning
Entering this command wrong could render your computer useless.
Info
disk0is the hard drive of your Mac and<volume>is the name of your external drive andimage.imgis the name of the file you will createTo restore go to internet recovery and swap the
ifandofarguments.This will also backup any partitions you have on your computer. This means if you have boot camp setup it will also backup and restore windows too. Bonus!
Disclaimer
I am not responsible for any damage that you cause to your system when entering in this command. Research the use of the
ddcommand if you are not sure how this works before proceeding.