Hi Devi Prasad ji
Section 209(4A) requires that books of accounts togther with vouchers must be preserved for minimum period of 8 years .
Section 160 and 161 provides that copies of all annual returns are required to be maintained for the minimum period of 8 years.
but as per my knowledge Minutes of BOM /AGM are required to be maintained for life time as minimum time period for the same is nowhere mentioned in the Comapnies Act,1956 similarly it is not given for ROC filing details ,It is my suggestion if it is possible maintained all statutory books for lifetime even ROC filing details should be kept forever at least in scanned copies as it may be required for refernce and submission at any time . though ROC is repository for all statutory filing records it requires to follow long procedure to get certified copies from ROC.