Question in regards to NAS to folder backup

[jordan12]

So I have a NAS with a total of 30TB of data currently. I have a backup setup with 8 drives combined that will have enough room to copy all NAS data over for a secondary backup.

Question is this: What would be the best method to keep the data between the 2 accurate? Rather than just recopying it all.

 

[drescherjm]

rsync

 

[Spartacus09]

Rsync as noted above or if its a appliance nas like qnap/synology the sometimes have a replicate to a external location option too.

 

[jordan12]

Any negatives to using Synctoy?