Script to backup minecraft server once a day to mega.nz (needs to be run manually)

backup.sh

#!/bin/bash

set -e

BACKUPDIR="../minecraft-backups"

set_most_recent_backup_file() {
    MOSTRECENTLOCALBACKUPFILE=$(find "$BACKUPDIR" -type f -printf '%f\n' | sort -r | head -1)
    echo "Most recent local backup file: $MOSTRECENTLOCALBACKUPFILE"
}

# Backup to local disk every 24 hours
set_most_recent_backup_file
if [[ "$MOSTRECENTLOCALBACKUPFILE" < "$(date -Iseconds -d '-1 day').7z" ]]; then
    echo "Creating a new local backup..."
    7zr a "$BACKUPDIR/$(date -Iseconds).7z" .
    find "$BACKUPDIR" -type f | sort -r | tail -n +20 | xargs -n1 rm
fi

# Copy latest backup to remote if it isn't there
set_most_recent_backup_file
mega-ls > /dev/null     # the following line freezes otherwise
if ! mega-ls | grep -F "$MOSTRECENTLOCALBACKUPFILE"; then
    echo "Removing older backups..."
    mega-ls | sort -r | tail -n +3 | xargs -n1 -r mega-rm
    echo "Copying lastest backup..."
    mega-put "$BACKUPDIR/$MOSTRECENTLOCALBACKUPFILE" "$MOSTRECENTLOCALBACKUPFILE"
fi
mega-quit

# Upgrade Paper MC if it wasn't downloaded in the last 24 hours
if ! find paper.jar -mtime -1; then
    echo "Downloading latest paper.jar..."
    wget https://papermc.io/api/v1/paper/1.15.2/latest/download -O paper.jar.down
    mv -f paper.jar.down paper.jar
fi

start.sh

#!/bin/sh
set -e
./backup.sh
java -Xms4G -Xmx4G -jar paper.jar