If you mean that the two sets of data are identical, then I think this is a bad idea. The reason for this is that it will be difficult to merge changes from one set into the other if they were both being used at once. If you want to have multiple copies of your data in different places, use something like git-annex or Dropbox instead (or whatever).
If you mean that there are some differences between the two datasets but they dont matter because they can be ignored, then yes, I agree with @davidfinckelsr: just make a copy and ignore any differences
https://t.co/VdlbtIEbiX