There are quite a few threads here about corrupt archives with various versions of ATI - I have also posted one.
After a fair amount of discussion, both here and with Acronis Support, I have found two things that cause this report:
1. Corrupt files
2. Not giving the Registry a good clean before backing up.
Having spent hours trawling through files looking for corrupt data and clearing it out, I then found it necessary to also run both Ccleaner and RegScrubXP to ensure a good backup. Since using this process I`ve not had a failure.
As for installing a corrupt archive, there are some posts here that indicate the backup works OK but I`ve not tried it myself.