derekb
Supported backups should work.
If Affa fails then you must be doing something wrong, or something else is wrong.
Use the Backup to Workstation option in server manager, & preferably backup to a locally connected USB drive of sufficient size (locally connected meaning attached to the SME server).
That is a lot of data you have & backing up across a network to a workstation desktop or workstation shared drive may be slow.
Then install the OS on the new hardware & configure the identical backup job & then select to restore from local USB.
You could also use the admin console backup to USB option, & upon first boot of the new OS (on new hardware) you will be asked if you want to restore, & if so, to insert the USB drive.
Supported backups should do what you want. Make sure everything you want to backup is included eg /opt
See the contrib article for ways of doing this
http://wiki.contribs.org/Backup_with_darFor alternative options & possibilities you can read the Backup server config howto
http://wiki.contribs.org/Backup_server_configYou could also do a direct disk to disk restore using this howto
http://wiki.contribs.org/UpgradeDiskI have not tried it on sme8 but assume it still works OK, as it is generic in nature.