This is a relatively simple upgrade, including a security fix. I am offering these at $10 a forum, with one custom style and low to medium number of MODs taking no backups. (The risk is minimal and repairable.) Cost including backups is $15 per forum (unless exceedingly large).
Upgrades are generally performed "live", during a quieter spell, with less than 5 mins downtime (closure).
Access required: FTP is sufficient. (just make a new FTP account, send me the details, and delete on completion)
By "forum" I mean a phpBB installation.
Upgrades for more than one level or with lots/complex MODs are P.O.A. and are always performed taking backups. (around $30 per level, inc 1 custom style)