Too many sm12 locks and sm13 updates pending in QA system

HI Friends,

We have lot of locks and updates in QA system  and I want to know from where are thry originatin? Why they are blocked?

This is the details of one of lock:

Client               110
User name            SAPOPS
Table name           VBAK
Lock argument        210$%&sdbatch

Lock Owner
Lock Owner           20140219013017403000002701ERQAS00....................
Host name           ERQAS00....................
SAP System Number    1
Work Process         027
Date                 19.02.2014   01:30:17   403000

Backup flag          X
Transaction Code
Lock Object Name     EVVBAKE
Cumulative Counter   0          1

Please suggest with all possible ways to check.