1. A method for use in managing data deduplication in storage systems based on I/O activities, the method comprising: evaluating input/output (I/O) operations activity of first and second data objects based on I/O access patterns for the first and second data objects, wherein the first and second data objects are selected for applying a deduplicating technique; and based on the evaluation, applying the deduplicating technique to the first and second data objects, wherein applying the deduplicating technique includes updating mapping information of the first and second data objects, wherein the second data object is deduplicated to the first data object upon determining that I/O operations activity for the first data object is higher than I/O operations activity for the second data object, wherein the first data object is deduplicated to the second data object upon determining that I/O operations activity for the second data object is higher than I/O operations activity for the first data object.