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Seasoned #Linux users, can I pick your branes?

My system at work has an enormous 250gb SSD, which is, it must be said, inadequate. So what I've done is install /root on the internal SSD, and /home on an external 1tb NVME SSD. It's a Sabrent USB3.2, using the short, supplied, known good cable.

Most of the time it's fine, but every now and then the system will sleep the external drive, then obviously it'll crash during the night when it tries to run my backup script from a drive it can no longer talk to.

What's the best way around this?

I've added 'usbcore.autosuspend=-1' and 'pcie_aspm=off' to the GRUB options. The former mostly worked, and the latter I've only just applied, so don't know whether it does. Is there anything else I could try that isn't just "get a bigger internal SSD"?