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Hi guys, I was testing btsync to see if it could replace unison in my setup, and hit a very nasty bug that seems to be frequent for a couple of users (ie http://forum.bittorr...by-older-files/ ). As it seems to be reproducible in all my tests I decided to set up a very simple environment to reproduce it. I don't think the configuration matters much as people in the forum seems to have the issue with Windows and Mac as well but here it is anyway : btsync 1.0.134 debian sid on both nodes one is amd64 the other i386. Tested also with a freebsd 9 server (Nas4Free x64) use the package provided by http://debian.yeasoft.net/btsync conf on both node (running as the user letic) : { "device_name": "LeTic - btsync Server", "listening_port" : 0, "storage_path" : "/home/letic/.btsync2", "check_for_updates" : false, "use_upnp" : false, "download_limit" : 0, "upload_limit" : 0, "webui" : { "listen" : "0.0.0.0:8888" } } Here are the steps to reproduce (host A is 1386, host B is amd64) : On Host A : mkdir btsync_test cd btsync_test Create a 1M file : dd if=/dev/urandom of=1 bs=1024 count=1024 Create a 10M file : dd if=/dev/urandom of=2 bs=1024 count=10240 Check the resulting timestamp. ie for me : ls -la total 11268 drwxr-xr-x 1 letic letic 4 May 27 12:26 . drwxrwxr-x 1 letic letic 574 May 27 12:00 .. -rw-r--r-- 1 letic letic 1048576 May 27 12:09 1 -rw-r--r-- 1 letic letic 10485760 May 27 12:10 2 On Host B : mkdir btsync_test cd btsync_test Create simple 1 and 2 file : echo "blabla" > 1 echo "test" > 2 Check the resulting timestamp. ie for me : ls -la total 24 drwxrwxr-x 2 letic letic 4096 May 27 12:45 . drwxr-xr-x 89 letic letic 12288 May 27 12:45 .. -rw-rw-r-- 1 letic letic 7 May 27 12:45 1 -rw-rw-r-- 1 letic letic 5 May 27 12:45 2 On Host A and B enable debug with debug.txt and start the btsync daemon On Host B add the btsync_test folder through the webgui. I just click on generate and choose the folder (so it use the default writable conf) In the GUI I get : /home/letic/btsync_test - 12 B in 2 files On Host A add the key from host B and choose the corresponding folder File from Host A are uploaded on Host B and replace the files that had a newer timestamp. Here is the result on Host A : ls -la total 11292 drwxrwxr-x 3 letic letic 4096 May 27 12:50 . drwxr-xr-x 89 letic letic 12288 May 27 12:47 .. -rw-rw-r-- 1 letic letic 1048576 May 27 12:09 1 -rw-rw-r-- 1 letic letic 10485760 May 27 12:10 2 -rw-r--r-- 1 letic letic 32 May 27 12:48 .SyncID -rw-r--r-- 1 letic letic 783 May 27 12:48 .SyncIgnore drwxr-xr-x 2 letic letic 4096 May 27 12:48 .SyncTrash Stopped both daemons Of course I attached both debug log, Hoping it will help you. Let me know if you need any more info. Cheers LeTic PS : Also sent to support email synclogs.tar.gz