diff --git a/postgres-backup-s3/Dockerfile b/postgres-backup-s3/Dockerfile
index af5740d..3fd968c 100644
--- a/postgres-backup-s3/Dockerfile
+++ b/postgres-backup-s3/Dockerfile
@@ -1,10 +1,11 @@
-FROM alpine:3.9
+FROM alpine:3.11
 LABEL maintainer="Johannes Schickling <schickling.j@gmail.com>"
 
 ADD install.sh install.sh
 RUN sh install.sh && rm install.sh
 
 ENV POSTGRES_DATABASE **None**
+ENV POSTGRES_BACKUP_ALL **None**
 ENV POSTGRES_HOST **None**
 ENV POSTGRES_PORT 5432
 ENV POSTGRES_USER **None**
diff --git a/postgres-backup-s3/README.md b/postgres-backup-s3/README.md
index e963929..b6aad85 100644
--- a/postgres-backup-s3/README.md
+++ b/postgres-backup-s3/README.md
@@ -19,6 +19,8 @@ postgres:
 
 pgbackups3:
   image: schickling/postgres-backup-s3
+  depends_on:
+    - postgres
   links:
     - postgres
   environment:
@@ -28,6 +30,7 @@ pgbackups3:
     S3_SECRET_ACCESS_KEY: secret
     S3_BUCKET: my-bucket
     S3_PREFIX: backup
+    POSTGRES_BACKUP_ALL: "false"
     POSTGRES_HOST: host
     POSTGRES_DATABASE: dbname
     POSTGRES_USER: user
@@ -41,3 +44,16 @@ You can additionally set the `SCHEDULE` environment variable like `-e SCHEDULE="
 
 More information about the scheduling can be found [here](http://godoc.org/github.com/robfig/cron#hdr-Predefined_schedules).
 
+### Backup All Databases
+
+You can backup all available databases by setting `POSTGRES_BACKUP_ALL="true"`.
+
+Single archive with the name `all_<timestamp>.sql.gz` will be uploaded to S3
+
+### Endpoints for S3
+
+An Endpoint is the URL of the entry point for an AWS web service or S3 Compitable Storage Provider.
+
+You can specify an alternate endpoint by setting `S3_ENDPOINT` environment variable like `protocol://endpoint`
+
+**Note:** S3 Compitable Storage Provider requires `S3_ENDPOINT` environment variable
diff --git a/postgres-backup-s3/backup.sh b/postgres-backup-s3/backup.sh
index 3b43360..7ab2573 100644
--- a/postgres-backup-s3/backup.sh
+++ b/postgres-backup-s3/backup.sh
@@ -18,7 +18,7 @@ if [ "${S3_BUCKET}" = "**None**" ]; then
   exit 1
 fi
 
-if [ "${POSTGRES_DATABASE}" = "**None**" ]; then
+if [ "${POSTGRES_DATABASE}" = "**None**" -a "${POSTGRES_BACKUP_ALL}" != "true" ]; then
   echo "You need to set the POSTGRES_DATABASE environment variable."
   exit 1
 fi
@@ -57,12 +57,43 @@ export AWS_DEFAULT_REGION=$S3_REGION
 export PGPASSWORD=$POSTGRES_PASSWORD
 POSTGRES_HOST_OPTS="-h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER $POSTGRES_EXTRA_OPTS"
 
-echo "Creating dump of ${POSTGRES_DATABASE} database from ${POSTGRES_HOST}..."
+if [ -z ${S3_PREFIX+x} ]; then
+  S3_PREFIX="/"
+else
+  S3_PREFIX="/${S3_PREFIX}/"  
+fi
+
+
+if [ "${POSTGRES_BACKUP_ALL}" == "true" ]; then
+  echo "Creating dump of all databases from ${POSTGRES_HOST}..."
+
+  pg_dumpall -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER | gzip > dump.sql.gz
+
+  echo "Uploading dump to $S3_BUCKET"
+
+  cat dump.sql.gz | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}all_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz" || exit 2
 
-pg_dump $POSTGRES_HOST_OPTS $POSTGRES_DATABASE | gzip > dump.sql.gz
+  echo "SQL backup uploaded successfully"
 
-echo "Uploading dump to $S3_BUCKET"
+  rm -rf dump.sql.gz
+else
+  OIFS="$IFS"
+  IFS=','
+  for DB in $POSTGRES_DATABASE
+  do
+    IFS="$OIFS"
+
+    echo "Creating dump of ${DB} database from ${POSTGRES_HOST}..."
+
+    pg_dump $POSTGRES_HOST_OPTS $DB | gzip > dump.sql.gz
+
+    echo "Uploading dump to $S3_BUCKET"
 
-cat dump.sql.gz | aws $AWS_ARGS s3 cp - s3://$S3_BUCKET/$S3_PREFIX/${POSTGRES_DATABASE}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz || exit 2
+    cat dump.sql.gz | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}${DB}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz" || exit 2
+
+    echo "SQL backup uploaded successfully"
+
+    rm -rf dump.sql.gz
+  done
+fi
 
-echo "SQL backup uploaded successfully"
diff --git a/postgres-backup-s3/install.sh b/postgres-backup-s3/install.sh
index bca5a1b..8701728 100644
--- a/postgres-backup-s3/install.sh
+++ b/postgres-backup-s3/install.sh
@@ -7,7 +7,7 @@ set -eo pipefail
 apk update
 
 # install pg_dump
-apk add postgresql
+apk add postgresql-client
 
 # install s3 tools
 apk add python py2-pip