valheim_backup.sh

#!/bin/bash
# Backup script for Valheim saves
#
# Twitter: @Kerbo_

# Colors
RED="\e[0;91m"
GREEN="\e[0;92m"
YELLOW="\e[0;93m"
NC="\e[0m"

# CHANGE ME
saveDir="/home/kerbo/.local/share/Steam/userdata/8456522/892970/remote"
backupDir="/data/backup/savegames/Valheim"

maxSaves=10
dateString=$(date +"%Y-%m-%d_%H-%M")

if [[ ! -d "$backupDir" ]]; then
    mkdir "$backupDir"
    if [[ ! -d "$backupDir" ]]; then
        echo "Error creating backup directory: $backupDir"
        exit 1
    fi
fi

# characters
cd "${saveDir}/characters" || exit 1

saves=(*.fch)

for save in "${saves[@]}"; do
    if [[ -f "$save" && ! "$save" =~ "_auto" ]]; then
        save_hash=$(md5sum "$save" | cut -d' ' -f1)
        backup_file=$(ls "${backupDir}" | grep "${save}-" 2>/dev/null | tail -n1)
        if [[ -n "$backup_file" ]]; then
            backup="${backupDir}/${backup_file}"
        else
            backup=""
        fi
        backup_hash=""

        if [[ -n "$backup" ]]; then
            backup_hash=$(md5sum "$backup" | cut -d' ' -f1)
        fi

        #echo save: $save
        #echo backup: $backup
        #echo save_hash: $save_hash
        #echo backup_hash: $backup_hash

        if [[ "$backup_hash" == "$save_hash" ]]; then
            echo -e "${GREEN}$save matches latest backup, no backup needed${NC}"
        else
            cp "$save" "${backupDir}/${save}-${dateString}"
            RET=$?
            if [[ $RET -eq 0 ]]; then
                echo -e "${YELLOW}Copied $save to ${backupDir}/${save}-${dateString}${NC}"
            else
                echo -e "${RED}Error! cp returned $RET for $save${NC}"
            fi
        fi

        count=$(ls "${backupDir}" | grep -c "${save}-")
        if [[ $count -gt $maxSaves ]]; then
            let trim=($count - $maxSaves)
            if [[ $trim -gt 0 ]]; then
                echo "Cleaning up $trim old backups for $save"
                ls "${backupDir}" | grep "${save}-" | head -n $trim | xargs -I SAVE rm "${backupDir}/SAVE"
            fi
        fi
    fi
done

# worlds
cd "${saveDir}/worlds" || exit 1

saves=(*.db *.fwl)

for save in "${saves[@]}"; do
    if [[ -f "$save" && ! "$save" =~ "_auto" ]]; then
        save_hash=$(md5sum "$save" | cut -d' ' -f1)
        backup_file=$(ls "${backupDir}" | grep "${save}-" 2>/dev/null | tail -n1)
        if [[ -n "$backup_file" ]]; then
            backup="${backupDir}/${backup_file}"
        else
            backup=""
        fi
        backup_hash=""

        if [[ -n "$backup" ]]; then
            backup_hash=$(md5sum "$backup" | cut -d' ' -f1)
        fi

        #echo save: $save
        #echo backup: $backup
        #echo save_hash: $save_hash
        #echo backup_hash: $backup_hash

        if [[ "$backup_hash" == "$save_hash" ]]; then
            echo -e "${GREEN}$save matches latest backup, no backup needed${NC}"
        else
            cp "$save" "${backupDir}/${save}-${dateString}"
            RET=$?
            if [[ $RET -eq 0 ]]; then
                echo -e "${YELLOW}Copied $save to ${backupDir}/${save}-${dateString}${NC}"
            else
                echo -e "${RED}Error! cp returned $RET for $save${NC}"
            fi
        fi

        count=$(ls "${backupDir}" | grep -c "${save}-")
        if [[ $count -gt $maxSaves ]]; then
            let trim=($count - $maxSaves)
            if [[ $trim -gt 0 ]]; then
                echo "Cleaning up $trim old backups for $save"
                ls "${backupDir}" | grep "${save}-" | head -n $trim | xargs -I SAVE rm "${backupDir}/SAVE"
            fi
        fi
    fi
done