# Behaviour with 3 devices **URL:** https://forum.syncthing.net/t/behaviour-with-3-devices/2970 **Category:** Support **Created:** [June 7, 2015, 6:08pm UTC](https://forum.syncthing.net/t/behaviour-with-3-devices/2970 "2015-06-07T18:08:58Z") **Posts on this page:** 1 **Showing post:** 3
### Author: ![Eddy2909](https://forum.syncthing.net/user_avatar/forum.syncthing.net/eddy2909/32/2011_2.png) [@Eddy2909](https://forum.syncthing.net/u/Eddy2909) #### Post date: [June 7, 2015, 7:51pm UTC](https://forum.syncthing.net/t/behaviour-with-3-devices/2970/3 "2015-06-07T19:51:18Z")
I copied a part of all my mp3s from Dev1 (my main pc) to dev2 (my cloud server) (its not finished yet). when starting dev3 after a while offline what will happen… will the missing files (50) on dev2 be deleted? Background story As I told [here](https://forum.syncthing.net/t/sync-conflicts-and-master-folder/2936/14), there have been some files deleted in the following szenario: As described some time ago, I uploaded some of my files (eg 200) from dev1(master - 300 files) to dev2. after deactivating master on dev1 and syncing with dev2 (250 files) and dev3 thee have some files been deleted from dev1 (formerly master) and I do not know why. I didnt delete anything on the slaves… that’s why I’m trying to exactly understand how syncthing works and behaves in several situations… --- _[View the full topic](https://forum.syncthing.net/t/behaviour-with-3-devices/2970)._