confused by the numer of .pbf files

I switched recently from from Acronis 10 to BR 10 home (after building a new system with Win-XPpro SP3 instead of the previous win2000.

Now I created a first image and I'm a bit surpised, that several .pbf files were created. I had the following settings for the first image:
- checked create image for partition c:\ - the system partition
- noticed that also an MBR image was offered and recommended in the help;
so I checked create image for MBR partition
- the default file types were excluded from the image creation

Now I have
- img_0....pbf / about 5,8 GB - obviously the image from c:\
- img_1....pbf / about 3,6 kb - what's this ?
- arc.......pbf / about 4,2 kb - what's this ?

What is the purpose of the two smaller .pbf's ?
What is the MBR image ? img_1 ? But so small ?
Do I realy need that MBR image for restoring c:\ in standard situations ?

Any hint is aprreciated

Regards
Olaf

 

Backup files description:

* arc_***.PBF (~KB) - Complex backup service file for listing sub-items
* img_0_***.pfm (~KB) - service file
* img_0_***.PBF (~KB) - First Hard Disk track and MBR backup
* img_1_***.00a .... img_1_***.010 - parts of partition backup if image splitting is enabled
* img_1_***.PBF (~GB) - partition backup (there could be several such files: one for each partition)
* img_1_***.pfm (~KB) - service file, that contains info about files and folders inside the archive for browsing and file restore
* img_1_***.pem (~KB) - service file, that contains info about excluding masks used for backup (could not present if no exclude masks were used)


In your situation Img_1 is for MBR and First Track and img_0 is for System partition. It depends on order of selection.