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Question about Incremental Backup

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I have a backup of my photos that consumes 720+ GB of space as a full backup. I have a 2TB disk that I also use for backing up other files that are much smaller. The Photo backup is set as Incremental, which means I want a full backup (which takes about 8 hours) on the disk and then Incrementals with the daily additons, which only take a few minutes. I schedule the photo backup for 2:00 AM. I set up the Photo backup and initiated it Saturday night at about 7:00 and it completed Sunday AM at 3:09. Looking at the Photo backup, it then performed another full backup this morning, which just ended. As a result, my disk only has about 224GB of space left. This is actually enough for what I need, but the Photo backup has a cautionary notice that "There is not enough free space."
Thus it will not do another Photo backup until I free up some space. If I try to delete the latest "version", It will delete both full backups.
Why didn't the Incremental just do an Incremental (1 to 2 GB) instead of the full backup this AM? Do I need to start the Incremental on schedule for it to recognize that a full has occurred?
I believe that it won't back up at all now; is there some way that I can force it to do an incremental, since I know that there is sufficient room?

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I think if you run a backup manually, then ATI won't count it in the same group as one started by schedule -- it's a. let's say, quirk of ATI. I think that's what happened here.

Also, you will need enough space for all your backups plus one full -- this is becasue when ati conolidates incs and the origianl full, it makes a new full file and it does that before it deletes the old files.

Said to say, I'd dete the backups nad task and start over and let it run by schedule. If you don't want to delete, then copy them to some other disk (prefereably removable) and then delete them within ati.

Erwin,
When you did the first manual backup, did you use the "backup now" option on the scheduled task?

It is always a good safety measure to have some redundancy in backup coverage. Hopefully, you have other copies of your photos on another drive. As photo's are already compressed, even a plain copy to another disk or DVD can provide some safety if your disk or backup should fail.