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My backup volume keeps filling up - I want a "set and forget" backup

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I have Acronis True Image 2014 backing up my PC to two different network drives. Occasionally it complains that the destination is full, even though I have it set to remove old backups. This is a real pain.

How do I configure True Image for a true "set and forget" backup where it'll remove old backups automatically when disk space is tight? I want it to keep as many old backups as it can until it runs out of space, then delete old backups until there's enough room for a new one.

I also want it to make incremental backups; there's really no point to having it do another full backup of files it's already backed up. I guess, in short, I want a mode where Acronis True Image works like Mac Time Machine. How do I set this up?

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You may limit the backup set by date, total number of backups, or total disk space used. Your message suggests that you may have done the latter, but ended up using more disk space for other things and not allowed even enough space for the set limit. e.g. If you set a backup task to delete backups when it reaches a total max. of 300 GB, but you store so much stuff elsewhere on the backup drive that it no longer has 300 GB available for the ATI backup, then that will cause problems. Whatever limit you set, you must ensure that the backup set will have that disk space available. ATI won't know about other uses of the disk.

There is a wealth of information linked to from the left margin of this forum. I suggest you spend time reading, to learn how best to use ATI.

Grover's How to Create/Manage Backup Tasks & Backups within Windows (includes How to Create a "Disk Image" or "Disk Mode" Image or "Disk mode" image & more) http://forum.acronis.com/forum/38691
29618: Grover's new backup and restore guides http://forum.acronis.com/forum/29618

I've gotten lost in the wealth of information - it seems like there are lots of ways to back up my system, but all of them require care and maintenance. I just want something on Windows as close to Mac Time Machine as I can get.

If there's not enough room for a new backup, how do I set Acorns True Image to delete its old backups until there is enough room?

That page illustrates the problem I'm having. I don't want to have to tell ATI to keep making full backups; that means it wastes time and bandwidth backing up stuff that's already backed up and that hasn't changed. And it doesn't make sense for me to tell it to automatically delete backups older than a certain date; this has nothing to do with the disk space available for backups, so it still means I'll either be running out of disk space or leaving disk space unused.

I don't want to have to fiddle with settings as if this were the 1990s. I just want it to make a full backup then keep backing up changed files until it runs out of space, then deleting old backups until there's enough room for a new one. A common-sense kind of backup. Looks like ATI doesn't handle this?