Rollback

[urugan]

Hello everybody, it's my first post.
I'm doing evaluation on nsis and inno to choose the one that suits me more.
I've read and seen enough, just need one last question answered.
Does NSIS supports rollback functionality?
I mean, if I have a scenario of upgrade, which contains copying a lot of files over existing installation and after that calling some sophisticated sql scripts, which can fail, will it be possible to (depending on sql actions outcome) rollback the whole installation to the point before upgrade?
I am pretty sure Inno has it.
p.s.
I don't want no flamewar, just a simple answer, perhaps with some links.