do you refer to facts/cubes that may get out of sync?
you might want to do the backup when there's no loading of facts/dimensions or have the loading processes do the cubes prior the loading of facts. Also, in case some batches are not processed 100% have some automated processes that check this and are able to repair (delete/reload batches).
ok, so either no backup is being done at all or a third party tool is installed that does the backup. I hope this tool is able to connect to the sql-server though, otherwise the backups may not be so usefull afterall.