E.g. if somebody made backup on HTC Evo you can restore his backup on HTC Evo.
It's also important yo use the same recovery on both devices.
Z.d.u.n.e.X's Stuff: Personal Site | My skins | Android Stuff's "Whatever you do in life will be insignificant, but it's very important that you do it, because nobody else will."
When you will install recovery you will see how easy is it.
Just go to recovery mode and there is option Backup/Restore.
If your recovery will clockworkmod then backups should be plaaced in /sdcard/clockworkmod/backup/banckup_name_or_date/*.img (Usually 4 flies: boot.img, recovery.img, data.img, system.img. If you will use app2sd backup will inclide sd-ext.img)
Z.d.u.n.e.X's Stuff: Personal Site | My skins | Android Stuff's "Whatever you do in life will be insignificant, but it's very important that you do it, because nobody else will."
Z.d.u.n.e.X's Stuff: Personal Site | My skins | Android Stuff's "Whatever you do in life will be insignificant, but it's very important that you do it, because nobody else will."