im looking to use dd to back up my whole hard drive regularly but it takes around 1.5 hours and want to know if there is a faster way to back up.
possibly just by updating the bytes which are different.
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The thing is, finding out which bytes have changed will involve reading both devices and comparing each byte. Doesn't sound very fast this way either. If you're ready to give up 'backing up the entire hard drive' and to instead do the backup at the filesystem level: AFAIK, these programs use some attributes like modification time and size which are available at the FS level. So they should speed things up a LOT (especially if most of your files do not change) | |||
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