I am looking for some software to do an auto backup. I am trying to backup a laptop via wireless to a NAS (network attached storage). Most auto backup software can be configured to backup at a time you specify, say every 2 days. I use my laptop everywhere and what I want is when I get home and turn it on I want it to do a backup. So I want it to do a backup every time it detects either my home network or the NAS. The backups don't need to be full backups, just all changed and new files since last backup.
Is there anything that can do this?