This function copies raw data from an external location (i.e. a mapped network drive) to a specified local project directory. In addition, a snapshot of the files being copied is taken and stored in the specified "cache_dir" so that files are only re-copied if changed.
backup_raw(from_dir, to_dir, cache_dir = "cache", force = FALSE)Directory to copy from.
Directory to copy to.
Directory to store cached file snapshots.
Logical indicating if copying should be forced.
Invisible - this function is used for its side effects