snapsnapshot.sh

#!/bin/bash
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# Script description  -scubamuc- https://scubamuc.github.io/ #
# Nextcloud-snap backup with Snap snapshot
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## 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
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# VARIABLES #
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SNAPNAME="nextcloud"
TARGET="/media/SNAPBACKUP"  ## target directory
LOG="$TARGET/snapbackup-nc.log"  ## logfile
SOURCE="/var/lib/snapd/snapshots" ## source directory
RETENTION="30" ## retention in days

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

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# SCRIPT #
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## must be root, enter sudo password for manual snapshot
## sudo pwd

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

## optional 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