You need to format the (ext3, ext4) an external USB disk drive for rsnapshot to be able to use work. rsnapshot uses a "hard links" feature that is unique to Linux/Unix filesystems. An external drive mounted via "Hard Links" are not supported on filesystems such as: '''"smbfs"''', '''"Samba (SMB)"''', '''"FAT"''', '''"FAT32"''', '''"NTFS"''', or '''"cifsCIFS"''' does not allow , '''"hard linksvfat"'''. It is not possible to create Also "Amahi Greyhole" can "mount"snapshot-Amahi shares that look like" backups on FAT or NTFS formatted volumes, nor local disk drives" these are Samba (SMB/CIFS as these filesystems do not support hard-linking) mounted shares.