Backup ownCloud calendars and addressbooks

README.md

A shell stub to backup ownCloud calendars and addressbooks as ICS or VCF. Maybe it works for Nextcloud as well.
In order to keep only one cleartext password, an owncloud backup user is used for authorization. All users wishing a backup of their data, have to share their calendars and contacts (read only) to this user and needs to be added to the config file...

oc.ics.vcf.backup

Config

• Create an user backup within your ownCloud.
• Share calendars and addressbooks read-only to the backup user.

Setup scripts

• CONFFILE
• ROOTDIR
• OCSERVER
• AUTHPASS

and CONFFILE content...

Some TODOs

• better error handling
• more things configurable
• with appropriate API backup all users of an OC instance (e.g. via group membership, etc.)
• ...

oc.ics.vcf.backup

#!/bin/bash

# In order to keep only one cleartext password, an owncloud backup user
# is used for authorization.
# All users wishing a backup of their data, have to share their calendars
# and contacts (read only) to this user.

CONFFILE=/path/to/oc.ics.vcf.conf
ROOTDIR=/path/to/owncloud.backup
OCSERVER='https://dav.example.com'
AUTHUSER=backup
AUTHPASS=secret

getcal () { # .ics
  local DIR=${ROOTDIR}/${1}/${DATE}
  local FILE="${DIR}/[${TIME}] ${2}.ics"

  mkdir -p $DIR 2>/dev/null
  wget -q --no-check-certificate --auth-no-challenge --no-clobber \
    -O "${FILE}" --http-user=${AUTHUSER} --http-password=${AUTHPASS} \
   "${OCSERVER}/remote.php/dav/calendars/${1}/${2}?export"

  if [ -e "${FILE}" ]; then
    chmod 600 "${FILE}"
  fi
}

getcard() { # .vcf
  local DIR=${ROOTDIR}/${1}/${DATE}
  local FILE="${DIR}/[${TIME}] ${2}.vcf"

  mkdir -p $DIR 2>/dev/null
  wget -q --no-check-certificate --auth-no-challenge --no-clobber \
    -O "${FILE}" --http-user=${AUTHUSER} --http-password=${AUTHPASS} \
    "${OCSERVER}/remote.php/dav/addressbooks/users/${1}/${2}?export"

  if [ -e "${FILE}" ]; then
    chmod 600 "${FILE}"
  fi
}

OIFS=$IFS
IFS=\|
grep -v ^# ${CONFFILE} | while read USER type NAME
do
  DATE=`date '+%F'`
  TIME=`date '+%T'`
  case ${type,,} in
    addressbook) getcard $USER $NAME ;;
    calendar) getcal $USER $NAME ;;
  esac
done
IFS=$OIFS

oc.ics.vcf.conf

# user|addressbook -or- calendar|name of addressbook -or- calendar
#
foo|addressbook|default
foo|calendar|default
bar|calendar|holidays