Transferring large folders of flac files


Hi folks,
I have about 1.8 TB of music stored in flac files, and the main copy is on an external hard drive. I want to make copies onto other external drives, as well as reload my MyCloud NAS. W10 file transfer always seems to time out, or stop for no apparent reason.

Is there a folder transfer product which would handle the transfer accurately without stopping?

Thanks for your attention.

C
128x128cmjones
Post removed 
I have 4tb's of music files I am in the process of transferring to a server from my Synology NAS.  Despite have incredible upload and download speeds on Mediacom, the process has been tortoise like. I have no completed all my 24 bit files and now starting 16 bit.  It has been two weeks of 24/7 and I am only 40% done.  I wish there was a faster way.
@cmjones , you may want to go to the microsoft web site and down load the latest version of synctoy. Does exactly what you want to do. its free and works quite well.

I have 4TB of hirez files I needed to move last year so used sync toy to do it.
http://www.microsoft.com/en-us/download/search.aspx?q=synctoy