Backup & restore android app data. Intended for rooted/recovery terminal or adb shell.

appdata-backup-restore.sh

#!/bin/sh
# Create a backup from one app datadir into a tape archive
# APP_DATADIR is the corresponding app data directory for the user you want to back up
# the primary is located in /data/data, for additional users see /data/user/
function abr_backup {
  [ $# -ne 2 ] && { echo "usage: $FUNCNAME APP_DATADIR BACKUP_FILEPATH"; return; }
  local datadir="$1"; local archive="$2"
  tar cf "$archive" -C "$datadir" --exclude="lib" . && echo "${archive} backup ok!"
}
# Restore app data from a tape archive and set proper file permissions & SELinux context
function abr_restore {
  [ $# -ne 2 ] && { echo "usage: $FUNCNAME APP_DATADIR BACKUP_FILEPATH"; return; }
  local datadir="$1"
  local archive="$2"
  local own="$(stat -c '%u' "$datadir")" &&
  local grp="$(stat -c '%g' "$datadir")" &&
  local ctx="$(ls   -Zd     "$datadir")" &&
  ctx="${ctx%% *}" &&
  while read -r item; do
    [ "$item" == "lib" ] && continue
    rm -fr "${datadir}/${item}"
  done <<<"$(cd "$datadir" && ls -A)" &&
  tar xf "$archive" -C "$datadir" --exclude="lib" &&
  while read -r item; do
    [ "$item" == "lib" ] && continue
    chown -hR "$own":"$grp" "${datadir}/${item}" || break
    chcon -hR "$ctx" "${datadir}/${item}" || break
  done <<<"$(cd "$datadir" && ls -A)" &&
  chown "$own":"$grp" "${datadir}" &&
  chcon "$ctx" "${datadir}" &&
  echo "${archive} restore ok!"
}
# Make sure that the application is stopped prior to backing up
function abr_backupruntime {
  [ $# -ne 3 ] && { echo "usage: $FUNCNAME USER_ID PACKAGE_NAME BACKUP_FILEPATH"; return; }
  local user="$1"; local pkg="$2"; local archive="$3"
  am force-stop --user "$user" "$pkg" &&
  abr_backup "/data/user/${user}/${pkg}" "$archive"
}
# Make sure that the application is stopped prior to restoring
function abr_restoreruntime {
  [ $# -ne 3 ] && { echo "usage: $FUNCNAME USER_ID PACKAGE_NAME BACKUP_FILEPATH"; return; }
  local user="$1"; local pkg="$2"; local archive="$3"
  am force-stop --user "$user" "$pkg" &&
  abr_restore "/data/user/${user}/${pkg}" "$archive"
}