Best S/W to Backup Synology NAS Before Disk Upgrade / NAS Reconfiguration

I had this question after viewing Need Recommendation on Expanding Synology DiskStation 412+NAS Capacity.

I need advice on the best software to backup my NAS prior to an upgrade.  I have a Synology DiskStation 412+ that has four 2TB WD Red drives configured in RAID 6.  I want to pull the four smaller drives and replace them with two mirrored 8TB WD Red drives. I have about 3.5TB of data on my NAS today.

In terms of my network, it is a Gigabit network and my server is Windows Server 2012 R2 Essentials. I have a brand new 8TB External HDD that I want to use to backup/restore my files.  I can connect this USB3.0 external drive to my Synology NAS, my Windows Server, or my PC that is running Windows 7.

My main concerns about this process is I want the final result (3.5TB of data on 8TB drives) to exactly match what I currently have.  I don't want to lose any files and I don't want any file attributes to change. I have some experience using RoboCopy and would want to essentially implement Copy DATSOU where all file attributes are copied unmodified (D=Data, A = Attributes, T=Time stamps, S= NTFS access control list (ACL), O=Owner information, U=Auditing information). I also want the directory timestamps to remain unchanged (in RoboCopy I believe this is /dcopy:T).

Q1. Is RoboCopy the best solution for me? If not, please suggest software that is hopefully low-cost.

Q2. Where should the backup device be installed? Attached to my NAS, my Windows Server, or my PC?

Q3. If RoboCopy is the best solution, should I run it from my W7 PC, or from my 2012 server? I don't think I can run it from the NAS since the NAS is running Linux, not Windows.

Q4. What is the best way to verify that my backup is complete and all file attributes were maintained BEFORE I pull out my old drives and reconfigure the NAS?

Finally, when I am done my NAS will have two empty drive bays. The NAS includes hot swappable drives. Is it possible for me to add a third 8TB Red drive to one of the bays, have it be a stand along drive and have the Synology backup the NAS to this drive? Or do I need to backup the NAS to an external HDD connected via USB3?

Thanks so much for your advice!
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I do not have experience with Synology, but I believe should not be much different than other brands. You should have the ability to run a backup of your NAS drive itself as a snapshot. Then you should prepare the HDDs for detaching and safely remove. Shutdown, replace the HDDs, create the new RAID and restore the snapshot. This procedure I did last month on my QNAP NAS drive when I was upgrading the HDDs. The exciting part was that during the building the new RAID I noticed that my backup is not complete and I plugged back the old HDDs, so system offered me to restore the original RAID, and I rerun the backup.
A similar procedure I experienced with Nasgear Ready NAS+, replacing the 1GB with 2GB HDDs in RAID 5.
My suggestion is to upgrade the firmware and restart the NAS drive few times before you start the backup and check the logs.

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Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: 8046586 (https:#a42407519)

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