diff --git a/Admin/cronjob/README b/Admin/cronjob/README
--- a/Admin/cronjob/README
+++ b/Admin/cronjob/README
@@ -1,59 +1,59 @@
 Administrative Isabelle cronjob
 ===============================
 
 - main server: virtual machine with cronjob and build_log database
-- backup file-system (for cumulative log files): isatest@lxbroy10:cronjob
-- backup identify job: isatest@lxbroy5
+- backup file-system (for cumulative log files): i21isatest@lxbroy10:cronjob
+- backup identify job: i21isatest@lxcisa0
 
 - jobs: manual installation on target directory:
     cp "$ISABELLE_HOME/Admin/cronjob/self_update "$HOME/cronjob/self_update"
     cp "$ISABELLE_HOME/Admin/cronjob/plain_identify "$HOME/cronjob/plain_identify"
 
 - crontab: manual update on target machine
     crontab -l
     crontab -e
 
 - $HOME/cronjob/run/ -- run-time state
 
 - $HOME/cronjob/log/ -- cumulative log area
 
 
 Build Log Database Server
 =========================
 
 - Ubuntu 18.04 LTS Linux Server standard installation
   https://help.ubuntu.com/lts/serverguide
 
 - apt install unattended-upgrades
 
 - special user account:
   useradd -m -s /bin/bash isatest
 
 - SSH access for jsch (on each client):
   LOCALHOST$ ssh-keyscan -t rsa DBSERVER
   >> ~/.ssh/known_hosts
 
 - PostgreSQL:
 
   $ apt install postgresql
   $ apt install postgresql-client
 
   $ sudo -u postgres psql template1
   ALTER USER postgres with encrypted password '***';
 
   $ edit /etc/postgresql/10/main/pg_hba.conf
   local all postgres md5
   local all all md5
 
   $ systemctl restart postgresql.service
 
   $ createuser -U postgres --interactive isatest
   ALTER USER isatest with encrypted password '***';
 
   $ createdb -E UTF8 -T template0 --locale=en_US.utf8 -U postgres -O isatest isatest
 
 - Database backup or migration:
   https://www.postgresql.org/docs/9.5/static/backup-dump.html
 
      pg_dump -U postgres -Fc -v -d isatest > db.dump
   pg_restore -U postgres -Fc -v -d isatest < db.dump
diff --git a/Admin/cronjob/crontab.lxbroy5 b/Admin/cronjob/crontab.lxcisa0
rename from Admin/cronjob/crontab.lxbroy5
rename to Admin/cronjob/crontab.lxcisa0