backup-checkallused: this only does a check of the configuration
files. It should give a cryptic summary of the configuration and
print 'configuration ok'. If not, fix your config files :->
+You have to create the file /var/lib/chiark-backup/last-tape
+containing the id of a tape; this helps backup-checkallused know where
+to start iterating over tapes. Any tapeid will do. (But don't make
+it the same as the one you want to back up to first.)
backup-loaded: this tells the scripts that a currently unlabelled tape
should be treated as tape X: eg: