As always, Binary Defense never recommends paying the ransom. There is never a guarantee of getting files back, and some decryptors like the one offered by ProLock are known to have flaws that can corrupt files during recovery. With the recent data theft and extortion trend from some ransomware groups, all ransomware incidents should be treated as data breaches as well. The 3-2-1 method of backing up data is a great way to ensure no data is lost during a ransomware infection. Keep three copies of the data on two separate devices with one of the devices stored off-site. It is far better to detect an intrusion early and stop ransomware from being deployed, rather than have to recover from backups afterward. Organizations should monitor security events around the clock, or employ managed security services such as the Binary Defense Security Operations Center (SOC) for 24/7 monitoring to quickly detect, contain and alert security teams to threats like this before they spread too far.
Sources: https://www.bleepingcomputer.com/news/security/fbi-warns-of-prolock-ransomware-decryptor-not-working-properly/

https://www.group-ib.com/blog/prolock