Is it possible to use Time Machine to back up to an external hard drive connected to a Mac on same wifi network?
Mac – Can Time Machine back up to an external HD connected to another Mac
backuptime-machine
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Best Answer
Yes. I've been doing this since Snow Leopard. All my MacBook Pros in the house do their Time Machine backups to an external USB drive that's hanging off an iMac running the standard OS X install (i.e. not Server). At the time of writing the iMac has been upgraded to Lion as has one of the MacBook Pros.
First, configure your target machine (the one with the USB drive attached):
File Sharing
is turned on and has a check mark next to itNow you need to configure your source machine (the one you want to keep it's Time Machine volume on this drive):
Select Disk...
Use Backup Disk
buttonYou're now all set up to use this remote drive as your Time Machine backup location. When Time Machine runs you'll see this drive appear as a mount on your system, and when it's done the mount will go away.
If you browse this drive from the target machine you'll see sparsebundle files, one for each machine that's doing a Time Machine backup to this drive, on the disk. These are the actual "disks" that Time Machine is using on each machine to keep the incrementals. If you click on one, it should mount and you should be able to browse it like normal.
If you have a complete disaster and need to do a fresh OS X install and recover from Time Machine you can point the recovery process at the remote drive and it will ask you to pick a sparsebundle from the drive to recover from. Or, and this is what I recommend, you can unattach the drive from your target and attach it via USB to your machine and do the restore over USB which is much faster.
I can confirm that complete restores from Time Machine backups kept in this manner work well. I've had to do two of them in the past few years on machines that keep their backups this way and both went smashingly well. Browsing Time Machine history in the Time Machine viewer can be a bit laggy, but it does work.