NFS or smbfs Filesystems for IDS backup?

Dear Informixers, for years, I've been backing up my logical logs and IDS data to disk using "ontape" with homebrewn scripts. Works like a charm on an "old" (4 years) Linux box (SuSE 7.2, Kernel 2.4.18) with IDS 7.31UD8. Now diskspace is running low on this machine, so I'm considering mounting an external filesystem for this purpose. I only have a Windows 2003 server for serving diskspace, and I could either mount a native Windows share from the Linux box via Samba (version 2.2.8a) or install Microsoft Services for Unix 3.5 and export a share via NFS. Which one of these two methods would be preferable for this purpose, or is neither one fast and/or safe enough and the only way to go would be to install additional disks? Regards, Richard