from.dir <- "J:/Radar_data/Beit_Dagan/RAW/2018"
## I want only the files from the night
to.dir   <- "J:/Radar_data/Beit_Dagan/night"
files    <- list.files(path = from.dir, full.names = TRUE, recursive =
TRUE)
## night_files is a vector I created with the files I need - only during
the night
for (f in night_files) file.copy(from = f, to = to.dir)

[1] "J:/Radar_data/Beit_Dagan/H5/2018/03/10/TLV180310142554.h5"
[2] "J:/Radar_data/Beit_Dagan/H5/2018/03/10/TLV180310142749.h5"
[3] "J:/Radar_data/Beit_Dagan/H5/2018/03/10/TLV180310143054.h5"