Originally Posted by xclub_101
All methods are very similar indeed - the only thing that you need to keep in mind is HOW you are going to restore the backup if things really go bad.
The "partition physical image" (with dd or similar) is IMHO simpler under all "normal" circumstances (and it might also hold older deleted files that other methods might not even see) but results in a slightly larger file. The only drawback that I see is if somehow you get bad sectors just in the middle of the memory for that partition - but as far as I know that is not really possible with modern NAND setups that have wear-leveling incorporated in their firmware.
Thank you very much - I'm almost satisfied and relaxed now
I'm very happy with the "dd"-method, because it produces a file around 20 MB - the bigger the better, IMHO - better backup too much than too little!
If something happens to my phone, e.g. the /efs-partition gets corrupt, can I always expect that I can boot up the phone, put the backup on my external SD-card and start up a terminal emulator program and then use the "dd"-method to restore /efs? Or should I use the ADB-commands (not exactly sure how to do it). Most important: I have the impression that my two 20 MB backups are fine...