[dnanian]

There are two solutions here, Par.

If you want the drive to be directly writable by OSX, you must format as HFS+. You can share it, using Samba, with Windows and Linux (or you can use a Windows driver that reads HFS+).

Alternatively, you can format as NTFS, but you'd have to share it through the network with Linux and the Mac.

Either way, you can't leave it as FAT32 if you want it to work with SuperDuper.