You can make a backup of the game against an app crash, or other trouble, from 'Other' and 'Backup' in the app menu.

The backup is saved as a file.  A name of the file is 'logquest2_backup.dat'. A location of the file is 'logquest' directory of your storage, and you can change the location from settings.

You can restore the file from 'Other' and 'Restore' in the app menu.

TIPS: You can copy or move from your device to other location (such as SD card or PC) by file manager apps or connecting to PC.

NOTE: You cannot backup adventure logs with this feature. Save logs independently in a log view screen.