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Nextcloud snap snapshot

Backup, restore or migrate Nextcloud snap using snap snapshots

Snapshots of Nextcloud snap are created with the snap snapshot utility. This works for random snapshots or as an automated backup script/cronjob and has the added convenience of easy Nextcloud snap migration to a new device when needed.

Snap snapshot will backup the entire snap including configuration, apps, certificates, database and data into a compressed file (*.zip) in /var/lib/snapd/snapshots

documentation

Procedure

  1. Stop Nextcloud (optional but recommended)
sudo snap stop nextcloud
  1. Create snapshot
sudo snap save nextcloud
  1. Start Nextcloud (see step 1.)
sudo snap start nextcloud#
  1. Find snapshot (*.zip) in /var/lib/snapd/snapshots and copy/move to wherever

This works fine as weekly automatic cronjob as root and has the added convenience of easy Snap transfer to different server when needed. thus always 4 weeks of Snap snapshots on backup media.

Snap snapshots may be scripted, see example below

Rotating Nextcloud snap snapshots script to media incl. logging:

1. create mount directory for media in /media or /mnt

2. mount media using /etc/fstab with option nofail

3. snapshots are kept for 30 days

4. save script in $USER/bin as snapsnapshot.sh

5. set preference variables

6. create root-cronjob for weekly execution ( 0 1 * * 0 su $USER /home/$USER/bin/snapsnapshot.sh )

#!/bin/bash
##############################################################
# Script description  -scubamuc- https://scubamuc.github.io/ #
# Nextcloud snap backup with Snap snapshots                  #
##############################################################
## create target directory "sudo mkdir /media/SNAPBACKUP"
## snapshot rotation 30 days 
## create crontab as root for automation
## 0 1 * * 0 su $USER /home/$USER/bin/snapsnapshot.sh
##############################################################
# VARIABLES #
##############################################################

SNAPNAME="nextcloud"
TARGET="/media/SNAPBACKUP"  ## target directory
LOG="/media/SNAPBACKUP/snapbackup-nc.log"  ## logfile
SOURCE="/var/lib/snapd/snapshots" ## source directory
RETENTION="30" ## retention in days

##############################################################
# FUNCTIONS #
##############################################################

## Timestamp for Log ##
timestamp()
{
 date +"%Y-%m-%d %T"
}

##############################################################
# SCRIPT #
##############################################################

## start log  
echo "********************************************************" >> "$LOG" ; ## log seperator
echo "$(timestamp) -- Snapbackup $SNAPNAME Start" >> "$LOG" ; ## start log

## optional but recommended, stop snap for snapshot  
 sudo snap stop "$SNAPNAME" ;
## create snap snapshot 
 sudo snap save --abs-time "$SNAPNAME" ;
## optional if stopped, restart snap after snapshot 
 sudo snap start "$SNAPNAME" ;

## find and move snapshot to $TARGET  
 sudo find "$SOURCE"/ -name "*.zip" -exec mv '{}' "$TARGET"/ \ ; # find and move
## find old snapshots and delete snapshots older than $RETENTION days
 sudo find "$TARGET"/ -name "*.zip" -mtime +"$RETENTION" -exec rm -f {} \ ; # find and delete

## end log 
 echo "$(timestamp) -- Snapbackup "$SNAPNAME" End " >> "$LOG" ; ## end log 
 echo "" >> "$LOG" ;  ## log linefeed 

exit

Restore snapshot using snap restore

  • When moving to new device, be sure to install Nextcloud snap first
  • Snap restore replaces previous installation incl. certs, DB and data
  • See documentation in snap restore --help and snapcraft

Procedure

  1. Copy snapshot (*.zip) from backup media to /var/lib/snapd/snapshots

  2. Discover snapshot-ID using snap saved

  3. Restore snapshot

sudo snap restore "snapshot-ID"