Apart from the regular patching ADOP also provides a phase known as FS Clone. 

FS clone mode can be only executed when there is no active patching cycle going on in the system.

When a fs_clone is triggered the Patch file system is incrementally synchronized with the run edition file system.

FS Clone might be needed to be executed some of the below scenarios.
  • The previous Online Patching cycle was aborted.
  • If we make any manual changes to the run edition file system
  • FMW or  Middle-tier technology components are patched.
  • After applying a big application RUP patch.
  • Loss of patch edition file system or corruption.

adop phase=fs_clone