Booting up from external backup - no longer

[Roger sinden]

I have been using a Freecom drive to backup using SD. When I first had the system up and running, I did check that I could boot from it and I could. However, today when I tried to boot from it, it did not appear as a boot-from option (as you should get when holding down the Option key at startup). I have run Dusk Utility although I can only Repair the Disk..all reported OK.

There are no error as far as I can see in SD's log..."Copy Complete" is the final entry.

Reformat and do a clean backup?

Any suggestions, please?

Many thanks

[dnanian]

Does it appear in the Startup Disk preference pane?

[Roger sinden]

Quick reply...many thanks.

No..all I can see is the iMac internal boot disk and Network Startup (unless that is the Freecom)

[dnanian]

Please send the log from your last backup using the 'Send to shirt pocket' button. Make sure to use "Error during copy" as the issue type.

[Roger sinden]

I've done that. I have three screen grabs available of the various parameter SU screens if that is of any interest.

[dnanian]

No need. As I indicated in my reply, you were using "Backup - user files" which only copies your Home folders, and not the system.