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Actually you can extract a ROM from a phone, but its only useful if you have lost the ROM file you flashed (and it's somewhat complicated).
Doing a dump from a phone doesn't get you any of your configuration (which is all stored on a separate partition even though it doesn't appear that way when you browse the file system)--it just gets the ROM contents, which are all in the \Windows folder. Nothing else would appear in the dump.
Anyway, as dannzeman said though, use SPB Backup. Just keep in mind that in order to properly restore you must be on the same ROM level. So if your backup comes from an AKU 2.x installation and you flash on a custom 3, you will get nothing but grief trying to restore onto that. You would need to reflash the AKU 2.x ROM, then you can restore your backup.
I know that is probably confusing because PCs don't really work that way. But these devices keep the \Windows folder and everything else totally separate. You can't back up both things at the same time (or even with the same software). The ROM flash puts on your OS and core apps, and then the backup software handles all of the other stuff.
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