- create a share to backup my Seagate movie storage device when it’s attached to my computer and access this share for DLNA purposes with my Roku
Personally, I would transfer my movies to the MyCloud, and use the Seagate as a backup target. Then your NAS (if you leave it running, which is usual), will be able to serve your movies to your Roku via DLNA, or to other devices via SMB, without needing your PC to be on.
Forgot to include in my last post - where does WD Sync fit in all of this?
WD Sync is one possibility for synchronising your devices to a backup on the NAS.
There are plenty of others that do the same thing, and probably better, since they are written as dedicated pieces of generic file sync software, not something written to support a product. I use FreeFileSync for backup and synchronisation purposes (synchronising between PC and NAS, and backing up PC and NAS to external HDDs).
ps. I agree with Bennor; take it one step at a time. See my suggestion on this thread:
