diff --git a/backup.nix b/backup.nix
index 6950b39..8970461 100644
--- a/backup.nix
+++ b/backup.nix
@@ -10,9 +10,8 @@ let
   user = "misskey-backup";
   group = user;
 
-  # shell script file to be sourced. must have values "MISSKEY_BACKUP_BUCKET" "MISSKEY_BACKUP_PREFIX" and "S3CFG"
-  # $S3CFG must be a path to a .s3cfg file compatible with s3cmd
   backupConfigFile = "/etc/misskey-backup/conf";
+  s3Cfg = "/etc/misskey-backup/s3cfg";
   backupScript = pkgs.writeShellApplication {
     name = "misskey-backup";
 
@@ -27,24 +26,22 @@ let
     excludeShellChecks = [ "SC1091" ];
 
     text = ''
-      source "${backupConfigFile}"
+      bucket="$(cat "${backupConfigFile}" | grep 'bucket=' | sed 's/bucket \?= \?')"
+      prefix="$(cat "${backupConfigFile}" | grep 'prefix=' | sed 's/prefix \?= \?')"
 
-      dir="$(mktemp --directory)"
-      echo "Using temp dir '$dir'"
+      s3Dir="s3://$bucket/\$\{prefix}misskey-$(date --iso-8601)"
+      echo "Uploading backups to '$s3Dir'"
 
-      trap EXIT "rm -rf '$dir'"
-
-      echo "Copying config"
-      cp /srv/misskey/.config "$dir/config" -r
+      echo "Uploading config"
+      tar -cz -C /srv/misskey/.config . | s3cmd put --config "${s3Cfg}" - "$s3Dir/config.tar.gz"
 
       echo "Dumping postgres database..."
-      pg_dump misskey | gzip > "$dir/postgres.sql.gz"
+      pg_dump misskey | gzip | s3cmd put --config "${s3Cfg}" - "$s3Dir/pg_dump.sql.gz"
 
-      echo "Copying redis database..."
-      cp /var/lib/redis-misskey "$dir/redis" -r
+      echo "Uploading redis database..."
+      tar -cz -C /var/lib/redis-misskey . | s3cmd put --config "${s3Cfg}" - "$s3Dir/redis.tar.gz"
 
-      tar -cz -C "$dir" . | \
-        s3cmd put --config "$S3CFG" - "s3://$MISSKEY_BACKUP_BUCKET/\$\{MISSKEY_BACKUP_PREFIX}misskey-$(date --iso-8601).tar.gz"
+      echo "Backup complete to '$s3Dir'"
     '';
   };
 in {