Is NFS: Shift savedata consider as locked data ? Cause I can't manual Copy from PS3 into my USB.
The rest savefile I can copy, like GTA4, GT5.

However, when I use Backup Utility to backup and restore into another bigger HDD (within same PS3), so far I notice all 100% things are copied.

No, you can't do that way shortcut. I recommend to download the PS3 3.61 firmware update into your PC first.

Minimum is:
(1) The new HDD (#1)
(2) Existing PS3 HDD (#2)
(3) A PC/Laptop with sufficient disk space (#3)

° Format #1 with Fat32 (1st post / google search)
° Plug #1 as USB into PS3, and run System Settings -> Backup Utility -> Backup (this backup may take 30min to several hours, depending on your size)
° Unplug #1 from PS3, plug into PC and copy all (including hidden files/folders, if any)
° Swap physical HDD into PS3
° Format #2 as Fat32, and copy back all files from PC -> #2 (to act as USB now)
° If you downloaded the firmware, you can copy to the proper folder also.
° Boot up PS3 (with #1) and follow instruction. It will take some time. If you have the firmware in HDD, you can save a lot of time from downloading 100MB+
° Once booted up, System Settings -> Backup Utility -> Restore

If it is the SAME PS3, all contents should be 99% there.

I have a spare USB HDD (#4), so I can skip the copy part

Forgot to tell you some steps (which is mentioned in 1st page there also)

° Before start backup, remember to sync trophies (need online) for all the accounts in the PS3
° After restore, sync again for all accounts.

Can, but when running on the older firmware, can't online PSN.

Each PS3 encrypts its own HDD. Your friend PS3 HDD will not be readable in your PS3, unless you do a fresh "format and partition". Just follow the PS3 message to guide you to format it.

Also, prepare the PS3 latest firmware in another USB drive (download from internet into PC)