Reasons for incremental backup on Progress OpenEdge
Time for the backup to run is a reason for doing incremental backup on Progress. My backup is running fast enough that I did not need to use this function and I'm still doing only full backups.

It also depends on your requirements. For example, if you have heavy financial transactions and you want to keep a backup every hour or something like that, you would need to do incremental (or real time).

But unless you have something forcing you to do incremental, I would do full backup, I find that easier to restore.

In terms of performance impact, if you have a fast disk array, I haven't seen much impact of doing a backup even during moderately heavy usage. Obviously it depends also on the size of your system. I'm talking about a 37Gb DB.