My Cloud Remote Backup from existing files (EX4100)

Here is a summary of the past few months:

-Have been using remote backup feature sucessfully between two identical My Cloud EX4100s at different houses for a few months
-Placed 4TB of files on main system
-Physically brought over backup system and manually copied new files to it
-Both machines are now identical
-Remote Backup feature won’t detect manually copied files and tries to overwrite manually copied data
-Cannot transfer that many files again over internet, too slow and other various problems

How can I make the WD My Cloud EX4100s recognise the manually copied files in the backup, is there a way of doing something like manually editing the backup logs of something? I desperately NEED a solution to this. I contacted WD Support and they couldn’t help. In summary - I need the main systemm to know that the other system already has the files and it should skip them and complete the rest of the backup. Thanks for any help in advance!

Hello Peasgopop,

The My Cloud EX4100 will overwrite the data when you will try to do remote backup on another device. There is no feature on the device to exclude the manually backed up data.

The remote backup uses rsync.
Here’s an overview of a few flags that may help you: https://stackoverflow.com/questions/13778889/rsync-difference-between-size-only-and-ignore-times
And here’s exactly what you need: a way to sync the timestamps - https://serverfault.com/questions/344731/rsync-copying-over-timestamps-only

You’ll need to SSH into your local EX4100, e.g. with Putty.
From your local EX4100, you need SSH access to your remote EX4100, using its public IP address.
The remote IP must have port 22 forwarded in the router to the remote EX4100.

ssh root@remoteIP

If this connection works, exit again. Then list the remote contents (note the : at the end)

rsync root@remoteIP:

Then sync the timestamps… something like this

rsync -vrt /shares/MyLocalShare root@remoteIP:/shares/MyRemoteShare