What are you backing up to? If it's an external HDD, do you perchance remove it when done with the backup? Maybe forgetting that you need to reinsert it for the next round of backups the following day?
Microsoft's backup program in Vista and 7 is modeled after Apple's Time Machine, which does regular incremental backups. It's not just back everything up and see you next month. I think Microsoft's is more like every day instead of every hour like Apple's, but the basic principle is the same. If it can't find the drive you did the last backup on, it's going to prompt you to make it available again.
I use the back up in Windows 7 and it seems to complete and then a day later I get a message in the Action Centre to
"Insert removable media to continue" - why does it do this.
Does it mean that the back up has failed even though it seems to finish?
Windows 7 64 Bit