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Due to the recent pandemic outbreak I had to switch to working from home. At the office I am using MacBook Pro which gets backed up to the dedicated Time Capsule device. It works as expected, nothing extra there. Unfortunately at home I didn’t have such contraption, but I had a custom built NAS based on Ubuntu 18.04 LTS. It turns out that you can emulate Time Machine by using Samba, just need to build it yourself as the one shipped lacks Spotlight support.

Please note that I based this tutorial on Mac TimeMachine with Samba 4.8.* on Ubuntu 18.10 and added some changes to have it working on clean Ubuntu 18.04 LTS. I also changed Samba 4.8.0 to 4.9.18 due to security issues which also fixed compatibility with libtracker-sparql.

First step is to install tools and dependencies required

apt update
apt install -y libreadline-dev git build-essential libattr1-dev libblkid-dev autoconf
apt install -y python-dev python-dnspython libacl1-dev gdb pkg-config libpopt-dev libldap2-dev
apt install -y dnsutils acl attr libbsd-dev docbook-xsl libcups2-dev libgnutls28-dev
apt install -y tracker libtracker-sparql-2.0-dev libpam0g-dev libavahi-client-dev libavahi-common-dev
apt install -y bison flex avahi-daemon liblmdb-dev libjansson-dev libgpgme-dev libarchive-dev

Create file /etc/avahi/services/timemachine.service with following contents (please note that there are some underscores there that are invisible when rendered but are copied correctly)

<?xml version="1.0" standalone='no'?>
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
 <name replace-wildcards="yes">%h</name>
 <service>
   <type>_smb._tcp</type>
   <port>445</port>
 </service>
 <service>
   <type>_device-info._tcp</type>
   <port>0</port>
   <txt-record>model=TimeCapsule8,119</txt-record>
 </service>
 <service>
   <type>_adisk._tcp</type>
   <txt-record>sys=waMa=0,adVF=0x100</txt-record>
   <txt-record>dk0=adVN=TimeMachine Home,adVF=0x82</txt-record>
 </service>
</service-group>

Download Samba source code archive and verify it. You need to unzip the tar file first as tar file is signed and not gzipped file (which is a bit odd).

cd /usr/src
wget https://download.samba.org/pub/samba/samba-pubkey.asc
gpg --import samba-pubkey.asc
wget https://download.samba.org/pub/samba/stable/samba-4.9.18.tar.gz
gunzip samba-4.9.18.tar.gz
wget https://download.samba.org/pub/samba/stable/samba-4.9.18.tar.asc
gpg --verify samba-4.9.18.tar.asc

After confirming its fine, unpack it and build it. On Atom N2800 with 4GB RAM and using pendrive as a storage it takes bit shy of 1 hour

tar -xzvf samba-4.9.18.tar.gz
cd samba-4.9.18
./configure --sysconfdir=/etc/samba --systemd-install-services --with-systemddir=/lib/systemd/system --with-shared-modules=idmap_ad --enable-debug --e
nable-selftest --with-systemd --enable-spotlight --jobs=`nproc --all`
make --jobs=`nproc --all`
make install --jobs=`nproc --all`

Create Samba configuration file /etc/samba/smb.conf. Please adjust path under TimeMachine Home to point at the directory where you want to keep backups. In my case it was /zstorage/backups/timemachine which is stored on ZFS.

[global]
# Basic Samba configuration
server role = standalone server
passdb backend = tdbsam
obey pam restrictions = yes
security = user
printcap name = /dev/null
load printers = no
socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=524288 SO_SNDBUF=524288
server string = Samba Server %v
map to guest = bad user
dns proxy = no
wide links = yes
follow symlinks = yes
unix extensions = no
acl allow execute always = yes
log file = /var/log/samba/%m.log
max log size = 1000

# Special configuration for Apple's Time Machine
fruit:model = MacPro
fruit:advertise_fullsync = true
fruit:aapl = yes

## Definde your shares here
[TimeMachine Home]
path = /zstorage/backups/timemachine/%U
valid users = %U
writable = yes
durable handles = yes
kernel oplocks = no
kernel share modes = no
posix locking = no
vfs objects = catia fruit streams_xattr
ea support = yes
browseable = yes
read only = No
inherit acls = yes
fruit:time machine = yes
fruit:aapl = yes
spotlight = yes
create mask = 0600
directory mask = 0700
comment = Time Machine

Create logs location and storage subdirectory (matching what you defined in previous step). Change USERNAME to your users name. Please note that this user needs to exist on the system running Samba daemon.

mkdir -p /var/log/samba
mkdir -p /zstorage/backups/timemachine/
mkdir -m 700 /zstorage/backups/timemachine/USERNAME
chown USERNAME /zstorage/backups/timemachine/USERNAME

Update password for the user

/usr/local/samba/bin/smbpasswd -a $USERNAME

Add Samba binaries path to /etc/profile and re-read the file

echo 'export PATH=/usr/local/samba/bin/:/usr/local/samba/sbin/:$PATH' >> /etc/profile
source /etc/profile

Apply a fix to systemd service definition (without it smbd won’t start correctly) and then start the daemon

sed -i 's/Type=notify/Type=simple/g' /lib/systemd/system/smb.service
systemctl enable --now smb.service

If you have a firewall running you need to allow port 445 access, for ufw it would be (assuming 192.168.0.0/24 is your LAN)

ufw allow from 192.168.0.0/24 to any port 445

Now you can setup your MacBook to use it the same way as it uses Time Capsule.

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Michał Margula


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