You should opt-in to the steam client beta for Linux, has many fixes, you might get lucky.
opt in for beta but no luck, problem remains
Its best to stay away from NFS when using the linux version of Steam. Only advice I can give.
Perhaps you haven't set permissions correctly. My NTFS have these mount flags, and I don't appear to have issues really. I did have issues before setting these however. Not sure if nosuid should be there....
gid=1000,uid=1000,nosuid,big_writes,nodev,nofail,x-gvfs-show,umask=000
I've just checked that backing up on regular drive works. I tried mount my NAS with cifs and it works too. So problem is really only with nfs.
I believe that it is not problem with permissions as steam creates dir and file successfully.
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
Steam client freezes when backing game files to nas mounted with nfs. killall -9 steam is necessary to stop client.
Steps for reproducing this issue: