Hi Genesh,
If you are on the lines that Ali mentioned, that is, using File System IDA and have one (or few) very big files, then, yes, we are bringing out an enhancement in V11 SP14 that would be of help to you. Basically, by breaking up a file into 'extents', and backing them up independently over potentially multiple streams, we are facilitating faster backups, and more importantly here, ensuring that the job restart granularity is at a sub-file level.
Feel free to reach out to me whener you plan to upgrade to SP14 or higher, and want to try out this enhancement.
Amit