The SisBackup is a program that lets you schedule backups or backups of your drives on your computer or computers, if I had a local network.
You tells the system what time you want to perform the backup units, giving as a parameter the number of days to consider modifications in recent days to backupear files.
This software saves backup for every opportunity the process all files that are modified in a span of days ago without regard to its content, ie may have backups of your work files is generated.