restore is usually $99 if you have a valid backup set.
but the process is fairly simple for the DB restore. unpack the files until you get the asterisk.sql file and then:
mysql -p
drop database asterisk
create database asterisk
exit
mysql -p asterisk < RESTOREFILE.sql
You'll need the root password for mysql, of course (if there is no root password, just leave off the -p). Note that if it succeeds, it will be silent for quite some time ... you can watch "htop" in another ssh session to watch it stay busy.
And get an unterruptible power supply (battery backup!) on the sql server. Really.
![Cool 8-)](./images/smilies/icon_cool.gif)