See my last post in What information is stored in /storage partition :
/tmp/log/local is the folder for local security log files folders - if you have a local management, older folders (0 1 2 3 4 5 6...) will be deleted. If managed centrally, logs are sent to the log server, so this /tmp partition is not so important anymore
So looks like there is local logging switched on in Embedded GaiA WebGUI !
Concerning R80.2SP: I did encounter the same issue a year ago, but lastly succeeded to set it to correct version. Use newest Jumbo + Dashboard on Management, and upgrade to R80.20.10 !
CCSP - CCSE / CCTE / CTPS / CCME / CCSM Elite / SMB Specialist