Daisy chaining two Lacie Rugged external hard drives


Novice Member
Hi there,

I'm about to start a new video editing project using Adobe Premiere, on my 27-inch iMac with Retina 5K (bought in May 2018).
My video project is HD.
I've just bought two identical external hard drives for the project. Lacie Rugged Thunderbolt USC-C (2TB each).
I would like to daisy chain these two hard drives for this project, so that everything I do is constantly being backed up from one hard drive to the other as I go.
I have a USB port if that's helpful.
I tend to be shoot new material all the time while editing, and adding that to my hard drive as I go. So I need that to be automatically added to the second hard drive when it's added to the first.
If someone could please explain to me how to set up the daisy-chain from beginning to end, and the workflow thereafter, I would be very grateful.

Here's the compatability spec of the two external hard drives:
Interface: USB 3.1 (USB-C)
Works with: USB 3.0, USB-C, Thunderbolt 3, Thunderbolt 2, Thunderbolt

Spec of my iMac:
IMAC 27"/RP575/CTO
PROCESSOR 4.2GHz QC I7, TB up to 4.5GHz
MEMORY 8GB 2400MHz DDR4 - 2x4GB
GRAPHICS AMD Radeon Pro 575 w/4GB VRAM
I added 2 x 16GB DDR4-2400 SODIMM Memory for Mac

Thanks in advance,



Novice Member
It looks like the only way I'd be able to do this with these Lace Rugged is to connect hard drive 1 to the computer using the Thunderbolt cable, then connect hard drive 1 to hard drive 2 with a USB C to USB C cable.

Can anyone tell me whether this would work?

I heard you can't daisy chain using USC, but I can't find a definitive answer.



Well-known Member
Well i always make my film projects and stills as well on two hard drives,i first render a film to one hard drive and after checking its ok simply copy it on to the other hard drive.


Novice Member
Thanks, but what I'm talking about is a continuous automatic backup throughout the entire edit (which will be going on for like 6 months).
My understanding is that's what daisy chaining is. As opposed to having to copy things across manually all the time and risk confusion.



Distinguished Member
What you want to do is perfectly reasonable, whether for PC or Mac. However, whilst it would seem an "obvious" User-Want feature it may not be so.
Care! I only know Windows a bit and AFAIK it can be done ( not quite daisy-chain, as you suggest), as there is a Win10 feature to write files to two HDDs - presumable they can be external, of different capacities... until one gets full.
Sadly I'm still cherishing my Win7 PC so AFAIK, I'd need special software. But OS providers always appear to lag behind consumer wants . . . Making a back-up will have been needed 20 years ago. Also, Movie Editing programs could easily offer this: i) Working copy and ii) separate on a second HDD backup Even in 2021, trying to add a further HDD is not a simple matter of screwing it in and connecting... and expecting the PC will recognise the extra drive and cheerfully make several options available. NOT a bit of it... it just sits there waiting for the user ( who hasn't done this before in years), to go through the various panels and type-in special words to make it do anything.... - - - - yet plug-in a USB memory-stick - and it wants to destroy your data by Formatting it.

Good luck, - perhaps post the FIX, for other Mac-users....


Distinguished Member
Are you wanting to just back up the clips you are filming or the whole project? Premiere Pro creates lots of previews, proxies and other project files as you edit and these are normally stored on a separate "scratch disk " if available. You can set these up to live on the same physical volume as the project and renders, but this would not be ideal if you are using external drives.

I would also look at a daily backup to some cloud storage - possibly overnight due to potential file sizes.

Probably worth a chat with a company who specialises in building edit systems as they will know how to set them up for least risk and best performance.



bag head

Active Member
I'd say a RAID 1 array as mentioned above is what you are thinking of, but is possibly overkill for what you need.
You might just be better having a scheduled incremental backup.
It's probably easier and less fussy to set up for a casual user.

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