SQL Job failed to start

I have just noticed an issue that has stopped sentora from working.
The Sentora panel cannot connect to the "sentora_core" and when I try to restart the SQL I get a "job failed to start".
I have tried a few web pages but they have not helped, so hopefully this can be fixed.

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I checked my logs and it says there is no space left, how do I clear the backup folder as the last thing I was doing was trying to download backups

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I found the backup path and the SQL managed to work again