that's the expected behavior. If your backup gets larger than a certain threshold, Akeeba Backup will start to create multi-part archives.
You can set a custom size (for example 10Mb, 500Mb or 1Gb), but Akeeba Backup will always break your archive if it gets larger than 2Gb. This is a technical requirement, otherwise the size of the backup will get "too large" and PHP would not fit its size within an integer variable.
So what you're seeing is the expected behavior. I suspect the previous large folder was created in another way, maybe from command line, since Akeeba Backup is imposing the 2Gb limit since from the beginning.
Developer and Support Staff
🇮🇹Italian: native 🇬🇧English: good • 🕐 My time zone is Europe / Rome (UTC +1)
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!