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# send email to optek@ompantek.com with advance warning before restoring from backup
 service opeventsd stop
service opconfigd stop
service opchartsd stop
service omkd stop
 
# confirm that the required Opmantek services have stopped (Applicable to NMIS 8 compatible apps only):
/usr/local/omk/bin/checkomkdaemons.sh statusstatus

# confirm that the required Opmantek services have stopped (NMIS 9 compatible apps):

service opeventsd status
service opconfigd status
service opchartsd status
service omkd status

cd
 
cd ~
mkdir temp
tar -xvf omk-backup-YYYY-MM-DD.tgz -C ~/temp
unalias cp
cp -R ~/temp/* /usr/local/omk
 
# at this point this error may occur:
#   cp: cannot create regular file '/usr/local/omk/bin/opchartsd.exe': Text file busy
#   cp: cannot create regular file '/usr/local/omk/bin/opflowd.exe': Text file busy
# if this happens: do
#       mv /usr/local/omk/bin/opchartsd.exe /usr/local/omk/bin/opchartsd.exe.old
#       mv /usr/local/omk/bin/opflowd.exe /usr/local/omk/bin/opflowd.exe.old
# and then: do
# cp -R ~/temp/* /usr/local/omk

#FOR NNIS 8 compatible apps only:
service opeventsd start
service opconfigd start
service opchartsd start
service omkd start
 
IMPORTANT STEP FOR NMIS 9 compatible applications:

You also need to run the installer for each previously application that was installed (reinstall)  in order to downgrade properly and have the initd and systemd services restored too.