Ok, so as a complete n00b at this....
To backup your current rom you need to? can somebody provide a link?
(I read something about winhex)
This backup file can be converted with this O2Tool to a PDA file?
With OCTANS_Downloader_v2.11 the PDA file can be restored to my phone or other phones?
But this is a ROM file so all my changes (emails, sms, phoneno.) are not saved?
Is this possible too or only with f.i. SPB Backup?
You see a lot of question marks, so please be patient with me.
1. To backup your rom, look for 'sorg utility' in this forum, it is an exe file, copy to your storage card, run it, wait for 5 minutes (it doesn't display nothing in the meantime) ,.. it says 'done' or something, then copy a saved file called 'rom_dump.bin' from storage card to PC.
Download my utility from this post, and drag and drop your 'rom_dump.bin' into my exe util (o2util.exe) ... this will leave you with a rom_dump.bin.nb0.
Save this file, THAT is your ROM backup.
3. Such NB0 files can be flashed to any I8000/I8000L phone, using Octans v2.11 downloader, that is correct.
4. NO. ROM contains the 'bare system', in a clean state, is like having a DVD of original Windows Vista.
5. SPB HAS NOTHIG TO DO ... What SPB backup does, is precisely save all the things you've 'done' after flashing, files, settings modified, contacts, mails, etc, etc. So, if you want to create a complete exact image of what you have now, then do a ROM backup, AND a SPB backup.