You can use a CD/DVD(RW) disks.
You can use USB/CF/SD (make sure it is fat32 so Lin & Win can mount/read easly)
there is a max file size in fat32 not sure how many GB it is.
If you want to network there are:
-Ethernet (this tends to be easy if you have NICs, cables, ect)
All depends on what HW you have, how often you want to do it and what is the ammount of data in MB/GB