InterFormNG2 contains an Audit log. In this log the major changes are logged. This includes:
Creation, modification and deletion of library resources (including templates modified in the designer).
Creation, modification and deletion of workflows,
Modification of settings.
Creation, modification and deletion of users.
It does not include a backup or versioning of the old resources, but it does trace who did what and when.
The audit log file is stored as a file in this path as default: C:\ProgramData\InterFormNG2\profiles\default\logs
Here the audit file is stored as interformng2_audit.log.
You can see the contents of the file either via file explorer or by signing on as a system administrator, select system Admin, and here select System logs and the audit log file on the top left like below:
