I don't know if this is the correct place to ask this question, but here I am.
I'm planning to create my own NAS using a RPI. The issue is that it is really difficult to have good performance using RAID with 2 USB HDD. Then I was thinking on using rsync and synchronized the 2 HDD during night hours. The 2 HDD will be 2TB.
And here my question, what is the performance of rsync on such a big volume of data through USB 2.0? When using low data volumes it's ok, but I don't know as I'm increasing the amount of it. Let's say I will put picture, documents, etc. and most of them are not gonna change a lot.