Comment 2 for bug 1426264

hi Minkyu
You can delete the log files without any issue. (sudo rm -rf /var/log/boot-sav )
This will not impact your boot.

This "huge logs" bug was present in some previous versions of Boot-Repair (4ppa26 , 27, 28, 30 and 31), and should be fixed with recent versions.
Please make sure to update the "boot-sav" and "boot-repair" packages before using the tool.