Mirror with one drive (like RAID)

[winterquilt]

I just found out that a RAID system requires two disks as a minimum. I would like to mirror my main drive in real time, but only have space for one drive.

I know that I can clone a drive, but I wanted something that updates like RAID would.

What options do I have please ?

 

[hg.wells]

What is your goal with this process?

If it’s for backup I’d recommend rethinking. If the drive fails it fails the whole thing goes. Which is why a RAID uses multiple disks.

 

[winterquilt]

Basically a clone that remains updated. I know that there would only be a redundancy of one, but that's the same for TimeMachine as well.

 

[hg.wells]

Time Machine should not be backed up to the same drive for the exact same reason. If backup is your strategy this is a bad approach.

 

[winterquilt]

I have two separate SSDs.

I think perhaps TimeMachine might be what I'm looking for ?

 

[Algus]

Yeah if your plan is to back up main drive on your computer to second drive that is a move.

My Mac mini has two external "discs" one of which is a single drive that I use for Time Machine for the Mini's internal drive and one of which is a RAID1 two disc array that I use for all my file server stuff. If my system drive fails, I have the Time Machine backup and for my file server if one of the discs fails, I have the other disc in the RAID so certainly very similar concepts