You can use "logical block protection" and multiple copies so that you can save archive copies in protected vaults, which will increase your data integrity by having multiple copies in different locations as well as increased protection from bit rot(from cosmic rays at least). Multiple copies can be created simultaneously, at the cost of tape drives.
You still have to read the entire disk copy to verify, which could take awhile if it's several TB in size. Though you still have several options to protect it from "bit rot", IE filesystems like ZFS and/or not using raid-0. If the data is important, you still have to back it up. Also, while it's on tape you don't have to worry about someone accidentally overwriting it with a single command. Especially the archived copies.