It stores the necessary info to restore executables (*.exe, *.com) files.
VRDB is not a backup system, the stored information is very small (not the whole files).
Besides, only Win32 executables are processed.
VRDB is a generic method, storing file parts that are often target of virus infections. Actually, VRDB scans all the local hard disks for executable files and stores some info about them. VRDB is not a backup system, the stored information is very small (not the whole files). Besides, only Win32 executables are processed. The VRDB data are stored in <avast>\Data\Integ\avast.int
It's not a frontend applications nowadays, you can almost forget it...