Data .bak files are they necessary

Running Win XP and version 6 of Smart security.
I notice that ESET keeps putting some very hefty .bak files in the all users backup folder, usually marked data.
My Easycleaner marks them as unecessary and I can delete them but they keep bouncing back.
Question: Are they necessary? Are they cumulative? How do I stop them?

I would be grateful for any advice.

 

ESET products do not create bak files. Do you have a reason to believe they are created by ESET and not by another application?

 

<?xml version="1.0" encoding="utf-8" ?>
- <BACKUP VERSION="1">
- <SNAPSHOT TIMESTAMP="5100F11B">
<MODULE ID="1" IS64BIT="0" BUILD="419" FILE="em000_32-1049.dat.bak" />
<MODULE ID="2" IS64BIT="0" BUILD="5DD" FILE="em001_32-1501.dat.bak" />
<MODULE ID="3" IS64BIT="0" BUILD="32B0" FILE="em002_32-12976.dat.bak" />
<MODULE ID="4" IS64BIT="0" BUILD="464" FILE="em003_32-1124.dat.bak" />
<MODULE ID="5" IS64BIT="0" BUILD="44F" FILE="em004_32-1103.dat.bak" />
<MODULE ID="6" IS64BIT="0" BUILD="42B" FILE="em005_32-1067.dat.bak" />
<MODULE ID="7" IS64BIT="0" BUILD="42A" FILE="em006_32-1066.dat.bak" />
<MODULE ID="9" IS64BIT="0" BUILD="482" FILE="em008_32-1154.dat.bak" />
<MODULE ID="A" IS64BIT="0" BUILD="4EC" FILE="em009_32-1260.dat.bak" />
<MODULE ID="B" IS64BIT="0" BUILD="405" FILE="em010_32-1029.dat.bak" />
<MODULE ID="E" IS64BIT="0" BUILD="40D" FILE="em013_32-1037.dat.bak" />
<MODULE ID="10" IS64BIT="0" BUILD="3EE" FILE="em015_32-1006.dat.bak" />
<MODULE ID="12" IS64BIT="0" BUILD="45F" FILE="em017_32-1119.dat.bak" />
<MODULE ID="13" IS64BIT="0" BUILD="43E" FILE="em018_32-1086.dat.bak" />
<MODULE ID="14" IS64BIT="0" BUILD="41B" FILE="em019_32-1051.dat.bak" />
<MODULE ID="15" IS64BIT="0" BUILD="406" FILE="em020_32-1030.dat.bak" />
<MODULE ID="16" IS64BIT="0" BUILD="521" FILE="em021_32-1313.dat.bak" />
<MODULE ID="17" IS64BIT="0" BUILD="401" FILE="em022_32-1025.dat.bak" />
<MODULE ID="18" IS64BIT="0" BUILD="84C" FILE="em023_32-2124.dat.bak" />
<MODULE ID="19" IS64BIT="0" BUILD="3EE" FILE="em024_32-1006.dat.bak" />
</SNAPSHOT>
</BACKUP>
This is a shot of an XML file.
The path is :- Docs & settings-All users-Application data-ESET smart security-Backup.
I have not been able to copy and paste the files here but one file is:-
em002-32-12976.dat.bak this is 34,747 KB I have deleted these files and await events.

 

I see, that's because you have the update rollback feature enabled.

 

Thank you Marcos.
I have been into advanced set up and un-ticked the snapshot option.
How it got ticked I do not know unless it was by default on upgrade or maybe I am growing senile
I have cleared the backup folder and nothing new has been filed.

Out of curiosity, if the snapshot option is ticked as selected, would the files be cumulative?

Thanks again.

 

The update rollback feature is enabled by default so that users can revert the engine or modules back to their previous versions in the event of an issue. Although such situation should never happen, the feature was highly demanded.

The number of files depends on the number of specified snapshots.