Mac Second Disk

Using a second disk for backups

The security setup on the latest versions of macOS is very strict. By default applications do not get access to other hard disks. OttoFMS uses the FileMaker Server default backup location. If that location is on another disk you will have to give OttoFMS access to that disk using the macOS Security and Privacy settings.

How to give OttoFMS access to the backup disk.

OttoFMS will need to be installed already. If you have not installed OttoFMS yet, please do so first. You may notice that OttoFMS won't seem to be running. That is because it can't access the backup folder.

Here is how you give it access:

Choose Apple menu  > System Settings.

Click Privacy & Security.

Select Full Disk Access.

Ensure OttoFMS is enabled

You may see the OttoFMS executable already in the list. If so, make sure it is enabled. If not, click the + button and add the OttoFMS executable. It is located in the OttoFMS/bin/ folder in your Applications folder.

  • Depending on the version of OttoFMS, the name of the executable will be either ottofms-macos or ottofms-macos-x64 or ottofms-mac-arm64.

Restart Otto


macOS Security and Privacy

Signs that OttoFMS does not have access to the backup disk.

Deployments fail with a permission error.

If you upgrade OttoFMS or FileMaker Server or MacOS, and suddenly deployments stop working with a permission error, it is likely that OttoFMS does not have access to the backup disk.

OttoFMS does not start.

If you can't reach the OttoFMS web interface after install, check the stderr.log file in Otto's log folder. If you see an error like this it is a sign that you have a second disk permissions error:

Error: EPERM: operation not permitted, mkdir '/Volumes/Backup/FMS Backups/_Otto_'