I'm trying to do a time machine backup, and my external HDD is full of time machine backups. So I've read that you just need to delete the backups and start again because of the way time machine works. What I want to know is instead of deleting all the time machine backups, can I just delete all of the incremental backups instead? That way next time I backup, it won't take all night AND I'll actually have enough space to do a backup. Thank you.