I’m a new owner. I had this problem with 7.2.2, upgraded to 7.2.3. Still getting the “can’t create disk image” error. I tried deleting the share and making a new one with 7.2.3. No luck. I looked at your settings and duplicated those, still errors. Note the only difference between your settings and mine is that you assign the share to a specific disk in your array. Mine used the setting to allow the share to be spread across the entire array. Changing to use a specific drive did not fix the problem. The difference between your setup and mine is that you have a long running unRAID server, kept up to date over time (I assume). Mine is a new server created 3 weeks ago with 7.2.2. The backup proceeds, the Mac says “preparing backup…”. The Main screen in the web UI shows continuous disk activity for about 10 minutes, then the error occurs. I look in the share and see a temporary sparsebundle folder structure. I’m only guessing, but it may be trying to rename the top level bundle directory and failing, or maybe it’s trying to set permissions or extra Apple ones. Output of testparm: root@unraid:~# testparm
Load smb config files from /etc/samba/smb.conf
lpcfg_do_global_parameter: WARNING: The "null passwords" option is deprecated
Loaded services file OK.
Weak crypto is allowed by GnuTLS (e.g. NTLM as a compatibility fallback)
Server role: ROLE_STANDALONE
Press enter to see a dump of your service definitions
# Global parameters
[global]
bind interfaces only = Yes
disable netbios = Yes
disable spoolss = Yes
interfaces = 192.168.0.49/16 127.0.0.1
load printers = No
logging = syslog@0
map to guest = Bad User
max open files = 40960
multicast dns register = No
ntlm auth = ntlmv1-permitted
null passwords = Yes
passdb backend = smbpasswd
printcap name = /dev/null
security = USER
server min protocol = SMB2
server multi channel support = No
server signing = if_required
server string = Media server
show add printer wizard = No
smb1 unix extensions = No
smb3 directory leases = No
fruit:nfs_aces = No
idmap config * : range = 3000-7999
idmap config * : backend = tdb
acl allow execute always = Yes
aio read size = 0
aio write size = 0
create mask = 0777
directory mask = 0777
hide dot files = No
include = /etc/samba/smb-shares.conf
invalid users = root
use sendfile = Yes
wide links = Yes
[TM]
comment = Time Machine
guest ok = Yes
path = /mnt/user/TM
read only = No
vfs objects = catia fruit streams_xattr
fruit:time machine max size = 5000000M
fruit:time machine = yes
fruit:metadata = stream
fruit:encoding = native
[windows-backup]
guest ok = Yes
path = /mnt/user/windows-backup
read only = No
vfs objects = catia fruit streams_xattr
fruit:encoding = native