Taking backup from old server

 systemctl stop tomcat9

find / -name update-sequences.sql

su dspace

psql -U dspace -f /dspace/etc/postgres/update-sequences.sql dspace

mkdir /home/koha/hk

pg_dump -U dspace -h localhost dspace > /home/koha/hk/dspace.sql

zip -r /home/koha/hk/assetstore.zip assetstore/

/dspace/bin/dspace solr-export-statistics -i authority
/dspace/bin/dspace solr-export-statistics -i statisticscd .ds    

cd /dspace

zip -r /home/koha/hk/solr-export.zip solr-export/

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