Simon,

I tried to go ahead and delete the files. One could not be deleted, the
other was rebuild by NetBackup to the same size. Conclusion: these are
not regular logfiles in the sense of a bpbkar log or something like
that, but the Sybase log files associated with the NetBackup databases.

Thanks for sending me the link, I already had it on my system but
apparently browsed through it a bit too quickly. From the page that you
pointed to it is very easy to derive that these files cannot be deleted.
Fortunately I didn't do any damage, at least as far as I can see now.

CU,

Marcel