I just ordered Acronis True Image 10, and I'm going to use it to back up a computer with important business information on it. To ensure that my data is safe, I'm going to be backing up to two external USB hard drives - one is a Maxtor OneTouch, the other is a Western Digital. One will be connected to the PC for nightly backups while the other is in a safe. Every week I'll swap the drives. Can ATI10 handle this okay? When it makes incremental backups, does it back up anything changed since the previous backup (which might be on the other drive), or anything changed since the most recent backup on this drive? If it only backs up changes since the previous backup, then I might lose any changes I made in the previous week, if one of the backup drives dies.