More specifically, you need to split the drive into two partitions since
TM will fill up all the space it is given. Once full TM will prune the
oldest stuff to make room for new stuff. This fill and prune process
fails on a drive partition that is used for other stuff (like another TM
backup). The partitions basically cap the amount of space any one backup
can use. I currently have an extra drive installed on my tower Mac split
into two partitions. Once does TM backups for the tower and the second I
connect to over the network as Jonathan has described to do backups for
my laptop backup. Works well and speed is only limited by your network
and drive performance. From my laptop I get around 50-60MB/s on my
Gigabit network. Wireless peaks at around 10MB/s on an 802.11N Airport
Extreme depending on distance from the basestation.
CB
On 5/16/12 2:42 PM, Jonathan C. Cohn wrote:
1. Mount the disk on one computer.
2. Partition the disk with two HFS+ journaled partitions..
3. Start back-ups of Computer one on one partition.
4. Possibly lock down security on second partition to only allow a specific
network user to use the disk.
5. Go to computer 2 and mount partition 2 using a user that can read/write to
the partition over the LAN. To do this go to finder's Go menu and find the
network menu item.
6. Now when you go into system preferences under time machine and click on
select disk, it will ask you once again for your user name and password and
then eventually start backing up the computer.
The primary issue with doing a backup like this is that time machine will
create a sparse disk image for the remote time machine disk that will have
little or no idea of other things writing to the disk, so if your Time Machine
backup gets full you could run into issues.
Best wishes,
Jonathan
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