Re: Byte level hard drive synchronization?
With dd; no. It will copy the entire hard drive byte by byte each time. Unsure about ddrescue but i imagine it will work the same way.
Three Quick questions however:
After the first initial backup (which will take a long time), will following backups be fast?
Yes but for the above reason. It will copy the whole hard drive.
If I delete a file on the internal HDD, will it delete on the external HDD?
Yes. They will both still work.
My internal HDD is fully encrypted using "TrueCrypt", will this command still work?
I don't see why you don't use Clonezilla to backup
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