Having completed a full backup, I schedulled a weekly differential backup, which seemed to be the easiest thing to restore not having to use a chain of backups. I backup to an external hard drive. When I checked what was on there, I found my original full backup and a whole seriese of backup files of varying sizes (not too different from my orignal backup). I thought that a differential backup should just leave one file stored plus the original or have I got this wrong? Is all OK? Which files do I use if I ever want to backup? Can someone please explain? Thanks.