Hi, I have a rMBP which uses an external Thunderbolt 2 drive. I want to maintain a backup of this external drive, which currently has about 3TB of data to backup. This is my initial backup of this drive and I have 1.76 TB backed up after running for 46 hours. At this point, I am above 50% complete with 12% duplication.

Equipment
rMBP Thunderbolt 2 external drive
Synology DS414 with 4 x 3TB WB Red drives in RAID10 configuration (50% capacity at this point)
I have both ethernet lines bonded with an HP switch that works with this type of connection. From the switch, I have one 1000 Mbps ethernet connection to the rMBP.

The DS414 is reporting both lan lines bonded for 2000Mbps Full Duplex and MTU of 1500.

Should 3TB take so long? At this point, it looks like I'll need about 100 hours to backup the entire 3TB.