I've tried different chunk sizes from 5mb to 100mb but it appears that WordPress sessions out before it can complete a transfer of a 4.45GB backup that was done on 6/18/2020. FYI, this was working previously as you can see from the attached document.
|WordPress version (in x.y.z format)||5.4.2|
|PHP version (in x.y.z format)||7.3.20|
|Akeeba Backup version (x.y.z format)||7.2.2|