I used rsynch tool because it it smart enough to copy ONLY new and changed files, so I can run it multiple times and transfer only the differences (delta).
$ sudo rsync -varpog --progress ~/Documents/SourceDir/ /Volumes/1TB_BU/DestinationDir/ Password:building file list ... 8943 files to consider.DS_Store 159748 100% 121.10MB/s 0:00:00 (xfer#1, to-check=8941/8943)2013-08-15 09.35.24.mp4 87290465 100% 22.57MB/s 0:00:03 (xfer#2, to-check=7445/8943)2013-08-15 11.51.18.jpg
...sent 26005122366 bytes received 163790 bytes 20565667.19 bytes/sec
total size is 35588964732 speedup is 1.37
Consecutive runs:
building file list ... 8943 files to consider
Options:
$ sudo rsync -varhpog --progress ~/Documents/SourceDir/ /Volumes/1TB_BU/DestinationDir/
building file list ... 8943 files to consider
sent 173.28K bytes received 20 bytes 346.61K bytes/sectotal size is 35.59G speedup is 205355.70
Options:
-h show full help
-v verbose
--progress show progress while transfer
--progress show progress while transfer
-h unman readable
-q quiet for non-error
-q quiet for non-error
-r recursive
-a archive
-b backup
-p preserve permissions
-o preserve owner
-g preserve group
-z compress data during the transfer
In depth explanation:
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/rsync.1.html
https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man1/rsync.1.html