Back up server / Mirroring recommendations please

[Make Money?]

Forum is on sys admins private racks at a server co.

I want a copy on a machine I own.

Here is the size of the forum:

Server Type Linux Data
Usage 824.11 MB
Web Server Apache v2.0.52
Index Usage 471.41 MB
PHP 4.3.9
Attachment Usage 15.25 GB
PHP Max Post Size 8.00 MB
Avatar Usage 19.01 MB
PHP Maximum Upload Size 20.00 MB
Profile Picture Usage 2.53 MB
PHP Memory Limit 64.00 MB
Unique Members Today 1,202
MySQL Version 5.0.27-standard
MySQL Packet Size 64.00 MB

Average online at once 400 - 600
Maximum ever on line = 1,000
30,000 members
8,000 active
6 Million page views per month

Whats the best way to keep a constantly updated copy in case the sys admins private racks go down?

I want it all, attachments etc..

I don't mind a little slowness at off peak times or even a total switch off for 5 mins per night to get it done if thats what it takes..

Thanks in advance,