Taper problems

I wonder if anyone can give me a clue here: I run taper to backup some directories. If I run it by hand it always works fine (running as root). If I run unattended but actually started from the bash prompt (/sbin/taper -U @fileset) it runs OK. When run as a script which repeats the bash prompt command it runs OK. BUT - when I have a line "27 0 * * mon-fri /sbin/taper -U @fileset" it aborts with the line that it cannot start a child process. It reads the fileset OK but simply won't complete. Any ideas? Anyone using the free version of Arkeia or what do you folk use for unattended backups? -- Best wishes, Derek Harding, (BA MIAP) ICT & Network Manager hardingd@warlingham.surrey.sch.uk