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I have been using SuperDuper a long time. I have four internal HDs in a Mac Pro, one for System and Apps, one for Files, and identical clones for backups. I backup every few days with SuperDuper and it usually takes only a few minutes for each backup.

Today I backed up the system drive and it went quickly as usual but the files backup (900,000 files) has been plodding along at 40mb/s. There have not been any major changes on that drive and after 30 minutes it shows 86gb evaluated, 45gb up to date and 32gb copied (whoa! - I didn't change that many files!).

Any clue what's going on?