Disclosed herein are systems and method for determining a backup schedule on a computer system. In one exemplary aspect, a method may comprise collecting user behavior data on the computer system and analyzing the user behavior data to determine an optimal time of a backup session to create backup copies of modified data stored on a volume of the computer system. The method may comprise determining an optimal duration of the backup session based on the analyzed user behavior and prioritizing portions of the modified data based on priority rules. The method may comprise determining a prioritized portion of the modified data that can be saved during the backup session based on the duration, computer system hardware and network bandwidth at the optimal time of backup, and performing the backup session comprising the prioritized portion.