"failed to connect to the device"

I’ve got a 3tb MyCloud connected to my iMac running Yosemite.  Im using it for Time Machine backups and for viewing media externally.  Everything was fine for the first couple of weeks, but now it says that it cannot connect to the device.  When I use the app on the iMac it gices me the “failed to connect” message.  If i try and connect through wd2go.com it shows the device but theres a yellow traingle that says “the device is offline.  connect it it to the internet.”  The drive appears in finder and i can access data through there, and the Time Machine bakups are still working as well.  Any adivce?

Hello and welcome to the WD community.

Mac backups are made in a proprietary file called sparse bundle. this files contain the baked up files, but the files are not accessible unless the sparse bundle image is mounted on the computer. Regarding remote connection I recommend checking to see if you have ports 80 and 443 forwarded. Have you tried trying to access the file locally?