Hello SLM and welcome to the forum.

In order for your husband's BiaB user files (or any files to be backed up) they need to be in a folder that gets backed up. So in this case, make sure he saves his .SGU files (and any other files he wants backed up) to a folder that's in the backup path so that your Backblaze software can back them up. The fact that you are running BiaB from an external hard drive is immaterial.

For 30 years or so this is a rough description of how I have organized my user files.
1. Start by creating a folder on the C: drive called "Data". This is a 1st tier folder.
2. Under the "Data" folder, create 2nd tier folders with names of interest like "Music", "Home", "Finances", etc.
3. Under the "Music" folder create a 3rd tier folder called "BiaB"
4. Whenever you create a song in BiaB be sure to save it in C:\Data\Music\BiaB (obviously you can create 4th, 5th, 6th or more tiers depending on how grannular you want your folder hierachy to be.
5. This is where the payoff and safety happens. When it comes time to backup your user files, all you need to backup C:\Data and everything underneath it including your BiaB files will be backed up.

Remember, if a file is not in the backup path (under your 1st tier folder) it won't be backed up.

Personally, I don't trust backing up to the cloud, mainly because of spotty internet connections. So we backup to a high capacity external hard drive.

Hope this helps.

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BiaB 2025 Windows
For me there’s no better place in the band than to have one leg in the harmony world and the other in the percussive. Thank you Paul Tutmarc and Leo Fender.