Asustor EZ Sync 2-way with backup mode

[Baz]

Could someone please help me resolve this? 
I have set up a two-way sync with EZ Sync. But I want to ensure that EZ Sync does not automatically delete files on the NAS when they are deleted on the PC, and so I now wish to enable the "Enable Backup Mode" option on the 2-way sync I have set up with EZ Sync.
Could someone please tell me where I find that "Enable Backup Mode" option in EZ Sync? I have searched, but cannot find it. 
I'm stuck at this point as I don't want to lose files but don't know how to correct this. I'm hoping I don't have to redo the 2-way sync from scratch...
Any help appreciated.
Thank you.

[shadowdeparture]

Could someone please help me resolve this? 
I have set up a two-way sync with EZ Sync. But I want to ensure that EZ Sync does not automatically delete files on the NAS when they are deleted on the PC, and so I now wish to enable the "Enable Backup Mode" option on the 2-way sync I have set up with EZ Sync.
Could someone please tell me where I find that "Enable Backup Mode" option in EZ Sync? I have searched, but cannot find it. 
I'm stuck at this point as I don't want to lose files but don't know how to correct this. I'm hoping I don't have to redo the 2-way sync from scratch...
Any help appreciated.

Thank you. 

scratch geometry dash

Open EZ Sync and go to Sync Tasks.
Select your 2-way sync task and click Edit/Settings.
Look for Enable Backup Mode and turn it on (if available).
Save changes and verify the sync behavior.
If not available, you may need to stop the current task and create a new one with Backup Mode enabled. Back up your data first to prevent file loss.