Hi,
I did check with host (GoDaddy). They said the site is not generating any errors. And there are no files in the folder /error log/
I don’t believe I have any other plugins that interfere — I only use a few. Tried again — it still got stuck. I’m letting it run, with only one other plugin activated — Wordfence
Last few lines of the log… replaced my site id with silly_site_issues —
1551.272 (4) Requesting upload of the files that have not yet been successfully uploaded (6)
1551.274 (4) Cloud backup selection (1/1): dropbox (last)
1551.282 (4) Beginning dispatch of backup to remote (dropbox)
1551.284 (4) Dropbox: begin cloud upload
1551.307 (4) Dropbox: access gained; setting chunk size to: 3584 KB
1551.647 (4) Dropbox quota usage: normal=875.3 MB, shared=0 MB, total=2816 MB, available=1940.7 MB
1551.649 (4) This is a resumption: 1048576 bytes had already been uploaded
1551.651 (4) Dropbox: Attempt to upload: backup_2016-05-14-1423_silly_site_issues_97f92ab8b122-plugins.zip to: backup_2016-05-14-1423_silly_site_issues_97f92ab8b122-plugins.zip
Thanks for trying to help fix the conundrum!!!