ZFS or EXT4 for a Single non-essential data drive

I'm adding shucked 14TB external drive to my Proxmox Server as a drive for non-essential data (ie. Linux ISOs). As a single drive, is it worth it for me to use ZFS or can I just use EXT4? Is there any real advantage to ZFS in this situation, especially if the drive is just going to fill up until I buy another one (ie. I won't be keeping it under 80% as recommended)

I'll also say that I have everything backed up to Backblaze, so this is not a single drive with one copy of data if that makes...

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