Script for backing up FoundryVTT data on my Linux server, meant to be run automatically.

foundry_backup

#! /usr/bin/bash

# The path to your FoundryVTT data. Change this as necessary.
DATA_DIR="$HOME/foundrydata/"

# Where you want your backups to be stored.
BACKUP_DIR="$DATA_DIR/../foundry_backups/"

# How many backups to keep before deleting the oldest one.
MAX_BACKUPS=5

CURRENT_HASH=$(find $DATA_DIR -type f -print0 | sort -z | xargs -0 sha1sum | sha1sum)

if test ! -d $BACKUP_DIR; then
  mkdir $BACKUP_DIR
fi

if test -f "$BACKUP_DIR/.foundry_hash"; then
  source $BACKUP_DIR/.foundry_hash

  if [ "$CURRENT_HASH" = "$HASH" ]; then
    echo "No change since last operation"
    exit
  fi
fi

echo "HASH=\"$CURRENT_HASH\"" > $BACKUP_DIR/.foundry_hash
tar -cJf "$BACKUP_DIR/foundry_data_backup-$(date +%s).tar.xz" "$DATA_DIR"

BACKUPS=$(ls $BACKUP_DIR | wc -l)

if (($BACKUPS > 5)); then
  rm "$BACKUP_DIR$(ls -t $BACKUP_DIR | tail -1)"
fi