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On Ubuntu/Debian Linux you can verify the disk is full with

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df -h

Then you'll either need to increase the disk size or delete some things in order to get space back

Common places to check for UniFi storage issues:

• Backups directory
• Syslog directory

To delete all backups:

 cd /usr/lib/unifi/data/backup/
rm *.unf

cd /usr/lib/unifi/data/backup/autobackup
rm *.unf

To delete all syslogs:

cd /var/log/unifi/remote
rm *.log

After your done, you might want to change your backup settings to backup less frequently or a reduce the maximum number of files

You can manage your backup schedule under Settings > System > Backups > Reschedule

This is a server wide setting

You should also disable any Internally Stored Activity Logging

This can be done under Settings > System > Integration

This is a site specific setting so it needs to be done for each site on your server