Ransomware attackers specifically target and attempt to destroy backup systems to increase the probability of payment. Hardening your system is critical. Please ensure you have reviewed your platform security using the Security Hardening Checklist
Quiescing the file system consists of two major tasks as listed in the following points:
Prohibit new I/O requests from initiating, which is called locking the file system.
Flush file system cache (write cached data back to disk). The system must complete any outstanding application I/O and note completion of outstanding metadata updates.