System SSD regularly overheats during backup

Hi,

On my OMV NAS, I run cronjobs with omv-backup and snapraid. Most of the time, especially after the backup, I get a warning like

Device: /dev/disk/by-id/nvme-***, Temperature 69 Celsius reached critical limit of 55 Celsius (Min/Max 32/78)

even though the backup itself only takes a minute. So I'm beginning to wonder if the backup is doing more harm than good, because it makes the system disk overheat on a regular basis. I tried to use the following command line for the cron job:

nice -20 /usr/sbin/omv-backup

but this didn't help, probably because "nice" only affects the relative priority of the backup process, it doesn't lead to a slow down if there are no other processes.

Is there a way to tell omv-backup to work more slowly? I wouldn't mind if the backup took an hour; it runs at night anyway.

Thanks, I'll do that then.