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Overwrite when disk gets full?

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Jason, the simple answer is no as ATI doesn't work in quite that way, however, you can use the automatic cleanup options to help you manage your backup disk space.

See the information on automatic cleanup from the ATI 2019 User Guide:

Automatic cleanup rules

To delete obsolete backup versions automatically, you can set one of the following cleanup rules:

  • Delete versions older than [defined period] (available for full method only) - Select this option to limit the age of backup versions. All versions that are older than the specified period will be automatically deleted.
  • Delete version chains older than [defined period] (available for incremental and differential methods only) - Select this option to limit the age of backup version chains. The oldest version chain will be deleted only when the most recent backup version of this chain is older than the specified period.
  • Store no more than [n] recent versions (available for full method only) - Select this option to limit the maximum number of backup versions. When the number of versions exceeds the specified value, the oldest backup version will be automatically deleted.
  • Store no more than [n] recent version chains (available for incremental and differential methods only) - Select this option to limit the maximum number of backup version chains. When the number of version chains exceeds the specified value, the oldest backup version chain will be automatically deleted.
  • Keep size of the backup no more than [defined size] - Select this option to limit maximum size of the backup. After creating a new backup version, the program checks whether the total backup size exceeds the specified value. If it's true, the oldest backup version will be deleted.

The key criteria for how ATI works in conjunction with the cleanup rules is that no backups are deleted until after a new Full backup has been made successfully - this is to ensure that you always have a backup to use!

My personal preference is using the Store no more than [n] recent version chains where I judge the size of my backup chains and allow for a new Full backup to be created without running out of space on the backup drive.