I disagree with the adverse comments in the link provided by Crossbow7, while I have had some quirks I find it on the whole very good. It certainly does not take a long time backing up, Vallidating, or for that matter recovering. I suppose there are always dissatisfied customers in all walks of life.
2011 does seem to have some quirks I do a full backup (no incrementals)every week,have just uninstalled ver 2010 and installed 2011
Having tried to restore last weeks backup made with 2010 I get the message this backup was made with a previous version and would not restore,I got out my 2010 recovery disc and it restored ok so there was no problem with the backup.
according to acronis 2011 is backward compatable check here click here