What does question mark in Veeam Explorer for SQL mean?

Challenge

In Veeam Explorer for SQL some of the databases listed have a question mark.

Cause

Question mark indicates lack of metadata for a database which may cause restore to be not fully functioning. Moreover restore points for such databases are not shown in the Enterprise Manager.
Most probable reasons are:
-    Due to lack of permissions metadata was not properly collected. Point-in-time restore will not be available.
-    Database was excluded from application-aware image processing. Such a database is in crash-consistent state.
-    Application-aware image processing was disabled for the whole virtual machine. Databases are in crash consistent state.
-    Database files are located on the disks excluded in job settings. Restore for such a database will not work.
-    you run VESQL from snapshot-only job. VSS metadata is not collected by design, and therefore heuristic search will be used

Solution

If fully functioning restore is essential, resolve the underlying issue. Note that new run of image-level backup is required, although restore from existing backup still will be partly unavailable.