I have Windows Vista Basic and want to start doing backups on a regular basis. I want to do the backups on a thumb drive. If I do a backup today, and another tomorrow, and there is very little additonal data for these days, does it take a shorter time to do the backup the 2nd day,( since there is only a little addtional data), or, more longer, because I am backing up everything the previous day PLUS the little additional data? Bear with me...........I'm new to this. Thanks in advance