increase to 7 now that it's pushing to larger storage

nixos/hosts/varda/resources/prune-backups.sh

@@ -1,14 +1,13 @@
 # Set the backup directory
 BACKUP_DIR="/mnt/storage/forgejo/backups"
 
-# Keep the 3 most recent backups
 KEEP_NUM=7
 
 echo "Starting backup cleanup process..."
 echo "Keeping the $KEEP_NUM most recent backups in $BACKUP_DIR"
 
 # Find all backup files, sort by modification time (newest first),
-# skip the first 3, and delete the rest
+# skip the first KEEP_NUM, and delete the rest
 find "$BACKUP_DIR" -type f -name "forgejo-dump-*" -print0 |
   sort -z -t_ -k2 -r |
   tail -z -n +$((KEEP_NUM + 1)) |