docs: add Backup documentation)

docs/molgenis/run.md

@@ -7,3 +7,4 @@ MOLGENIS EMX2 can be run via
 * [cloud deploy on kubernetes + helm](run_helm.md)
 * [by compiling the source code (for developers)](run_source.md)
 * [OIDC integration](use_permissions.md)
+* [Backup](run_backup.md)

docs/molgenis/run_backup.md

@@ -0,0 +1,53 @@
+# Backups 
+
+
+Currently all data is stored in postgresql. In order to guarantee fast recovery after a hardware or software failure, we suggest to make daily backups.
+
+## Backing up the database
+
+Postgres comes with a variety of methods to backup and restore the state of your database. 
+The ideal tool for handling backups of your database is the the 'pg_dump' utility which comes with PostgreSQL. 
+We recommend setting up a cron job to do a pg_dump of your database every night
+
+
+## Example 
+
+Script below is making daily backups (max of 14 days) in the /var/molenis-backup folder.
+You could use this script as a [cron.daily](https://en.wikipedia.org/wiki/Cron) script.
+
+
+```
+####
+#
+# Molgenis EMX2 local PGSQL backup. 
+#       - pgsql backups on local server for local backup en restore usage
+#       
+# Restore can be done by: 
+# su - postgres -c "zstdcat /var/molgenis-backup/posgresql-<<date>>.sql.zst | /usr/bin/psql"
+###
+
+USER="molgenis"
+
+# Days to keep (minimal 4 for weekend overlap) increase for your setup
+KEEP_DAYS=14
+
+BACKUP_DIR="/var/molgenis-backup/"
+CURRENT_DATE=$(date "+%d%m%Y")
+
+if [ ! -d $BACKUP_DIR ]
+then
+        mkdir -p $BACKUP_DIR
+        mkdir -p $BACKUP_DIR/TMP
+        chgrp $USER $BACKUP_DIR
+fi
+
+# Cleanup Old backups
+find $BACKUP_DIR/* -mtime +${KEEP_DAYS} -exec rm {} \;
+
+# backup
+sudo -u postgres pg_dump molgenis | zstd >> ${BACKUP_DIR}/postgresql-"${CURRENT_DATE}".sql.zst
+
+
+```
+
+