Chris has 6 TB of photos backed up on a RAID and he wants to back that up. How can he do it faster and safely? Leo says that RoboCopy is built into Windows and it validates the data after he copies it. FastCopy is another option.
The chatroom suggests automating with PowerShell. Leo also advises getting another NAS like Synology, which is has copy and validations built in. SysAdmins use RSync to do it. Rich Copy is another. Here's great article on how to migrate from an old NAS to a New NAS overnight.
Leo also recommends checking out DPBestFlow.org.