use generic wording in 30_check_backup_and_output_url (issue925) #927
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Use generic wording in error messages
because prep/default/02_translate_url.sh
may translate a BACKUP_URL into an OUTPUT_URL
so that errors in a BACKUP_URL may appear when
testing the translated/derived OUTPUT_URL
see #925
First steps to be prepared for 'se -e' which means
replacing COMMAND ; StopIfError ...
with COMMAND || Error ...