Thank you Alfonso  

I have started doing it subjects wise, I have taken 25 subjects in a group at once and performed the default preprocessing pipeline. it took around 12-13 hrs to execute (with 8GB RAM, i5, windows). Suddenly due to power fluctuation the process got terminated. I have checked the log file it shows the following lines as the last performed steps-

 Importing results to CONN project
2024-Jun-13 23:43  : Updated 2nd-level covariate QC_NORM_func
                     saved E:\conn_project01.mat
                     Preparing functional Label current functional files as "mni-space data"
                     Performing functional Label current functional files as "mni-space data"
                     Importing results to CONN project
                     saved E:\conn_project01.mat
                     Preparing structural Center to (0,0,0) coordinates (translation)
                     Performing structural Center to (0,0,0) coordinates (translation)
                     Importing results to CONN project
                     Structural centering translation x/y/z = [-3.31220245361328 0.5 15.5] (Subject 1)
                     Structural centering translation x/y/z = [-2.37470245361328 1.6719970703125 19.25] (Subject Structural centering translation x/y/z = [-5.79820251464844 -0.660995483398438 0.678001403808594] (Subject 3)
 Structural centering translation x/y/z = [-0.13100790977478 -13.093994140625 -17.3119964599609] (Subject 4)
Structural centering translation x/y/z = [-3.31220245361328 0.5 14.6799926757812] (Subject 5)                    Structural centering translation x/y/z = [6.06279754638672 0.5 14.093994140625] (Subject 6)
Structural centering translation x/y/z = [-0.968498229980469 0.5 -13.5619964599609] (Subject 7)
Structural centering translation x/y/z = [-6.59349822998047 -2.781005859375 -13.406005859375] (Subject 
2024-Jun-13 23:44  : Structural centering translation x/y/z = [-4.24970245361328 -1.843994140625 7.53199768066406] (Subject 9)
 Structural centering translation x/y/z = [-5.18720245361328 -1.843994140625 -11.5700073242188] (Subject 10)
 Structural centering translation x/y/z = [-3.31220245361328 -5.75 -19.656005859375] (Subject 11)
 Structural centering translation x/y/z = [1.37529754638672 -4.18800354003906 3.19599914550781] (Subject 12)

I am confused now whether should i restart the whole process-  but in that case all the preprocessed files will be processed again. If choose resume then from which preprocessing step should I start with. 

I want the whole processing to be done properly as it happens in default pipeline, so that there wont be any missing file error in the denoising or further analysis.

Thank you in advance

Meenakshi