The uniqueness of the software we use is not only that it is very efficient and extraordinarily stable, but above all that data once backed up is completely write-protected and the month-end balances are unchangeable.
This feature might also backup encryption trojans, but have no influence on previously backed up data structures.
In case of a cryptolocker incident, you as a customer can therefore simply "turn back the clock" until before the encryption happened by the Virus and restore your data easily and quickly. With current virus scanners, you can also clean an infected but not yet encrypted data structure.
Once encrypted by Cryptolocker, it is too late, too expensive or irreversible. Your data may be irretrievably lost, you are simply risking the survival of your company.