Does this sound right, SuperDuper took 4.25 hours to backup my drive (to ext drive)

[techmonkey]

I just downloaded SuperDuper today to backup my 120GB MBP hard drive to my new Maxtor One Touch 4 USB 2.0 external drive. I did some test last night transferring single files to the external drive, and I get about transfer rate of 18.18 MB/sec.

Here is how I am backing up with SuperDuper.

1. I followed the "How to backup to an Image" FAQ on the forum. I created a encrypted, sparse image the size of my MBP hard drive, 120GB.

2. I then chose the full backup feature on SuperDuper.

Finally finished the backup.

Here is the log

603,332 files evaluated. 593,396 files copied. Effective copy speed 5.07MB/s.

Elapsed Time: 4:12:27

The resulting image is now 72.8 GB

At 15,147 seconds, thats about 4.8MB/s on average.

Shouldn't it be at least 2-3 times faster ?

 

[Vader]

I would guess that is because of the encryption, but that is just a guess.

I know that when you make a compressed image with CarbonCopy it takes forever because it is compressing it. SO I would assume the encrypting has the same effect for you.