Hi John,
As Daniel states here the was a problem in both 'Export' and 'Import' functions which was fixed in software versions from 'B2B Jun 29 2020' and onwards. The symptom was that the 'Export' would run for about 4.5 hours and then either stop or crash. A 'Web Upgrade' will fix those issues.
I have plugged your stats into my 'Brennan Estimator' spreadsheet which has given the following details.
1. Estimated size of Export: Approx 600GB (your figure is 69.48GB; hopefully this is a typo?)
2. Estimated time to Export: Approx 22.45 hours
3. Total number of files in Export: 1,718
The estimates (items 1 & 2) are useful to provide you with a reasonable idea that your Export is running to completion, but are just estimates.
The 'total number of files in Export' (item 3) should be equal to or very close to this figure. If your total is not close to this figure, and is smaller, then your Export has not picked up all of the B2's music folders and files.
Regards,
Peter.