A couple of things: wikidb.servername.$DAY is just a gzipped mysql dump of
the database. wikifiles.$DAY.tbz is simply a tar of the entire directory
structure. I have a cron job run daily to backup both.

Create Database
Mysql –u root –p
Create database wikidb;
Exit
Restore Database files
Cd /<backup location>
Gunzip wikidb.servername.$DAY.gz
Mysql –u root –p wikidb < wikidb.servername.$DAY

Ensure database restored
mysql -u root -p wikidb
show tables;
<list of tables (about 35 should appear).

Create Wiki User account in MYSQL
Mysql –u root -p
create user 'wikiuser'@'localhost' IDENTIFIED BY 'password to be used:
IMPORTANT make sure this is also the same as in the LocalSettings.php
file!';
Grant privileges to wikiuser on wikidb database
Mysql –u root –p
GRANT ALL ON wikidb.* TO wikiuser at localhost IDENTIFIED BY 'password to be
used';
Flush privileges;

Restore wiki config files and images
Cd /
Tar –xvjf /<backup location>/wikifiles.$DAY.tbz
Complete restore process complete – to make sure, perform test plan again

Potential things that ** may ** be required are:
/<wiki install>/maintenance/php5 rebuildall.php
Double double check the correct database, username, password are used in the
/<wiki install>/LocalSettings.php file
Make sure apache is set up correctly, and the wiki location set
appropriately in the LocalSettings.php file