Cannot select volume in time machine preferences

Ok i seem to have a problem selecting a volume as a time machine backup
I was able to select it previously but since doing the 10.7.3 update i now cannot see it in the time machine prefs
The drive is connected to my iMac with 10.7.3 server & i'm sharing it on my home network
I can connect & mount it fine on my Macbook Pro & it appears on my desktop with the 3 people icon on the front i can access it no problem
I just cant see it in the tiime machine prefs but i could no problem before the update
Am i missing something or is there something new i dont know about
Thank you in advance 

Idefix6 wrote:
sry, maybe I understood you wrong.
If I change one file on my file fault (which is around 40GB of size) does time machine then backup the complete sparse file again or only transmit the change?
it only backs up the changes. that's why sparse bundles were introduced in leopard - precisely to deal with this very issue. a sparse bundle disk image as opposed to a regular sparse disk image is split in a number of small bands (8Mb in size by default). when TM does incremental backups it only backs up afresh new and changed bands and hard links the unchanged bands to existing backup copies. that makes backing up sparse bundles using TM somewhat bearable. if you try to back up a regular disk image with TM it will back it up afresh after any change however tiny to its contents. that would quickly fill up the backup drive if you are talking about a 40GB disk image.
If it only transmit the change I can move out my parallels disk to the folder All Users and ignore the file here.

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