It appears you have configured the VPN3030 to save log on wrap, this means it creates a file once the buffer is filled with logs, and is left in the flash, which you can view in the file management area. The flash has gotten full too.
In usual situation, the VPN3030 will have saved a crash file for crash situation before it reboots itself. Since flash is full, then there will not have been chance to do this.
If this is the first time this has ever happened, then the best way to move forwards it to clean up the files not needed in flash through file management. Delete any unknown, unwanted files, except for configuration left in there.
Also ensure the ftp server for logging is up and running, and use that for having your logs being saved. Disable the save log on wrap feature.
This way, if ever you have a reboot, hopefully, you get a crash file that can possibly be analyzed.
Based on what you have attached, all we can tell is that you had a none working ftp server for sending logs, and that your flash is full due to the save log on wrap function being enabled and you may have had so many files in flash that has been left unmanaged.
Regards,
