After the Big Sur upgrade I was unable to get this into my existing backup. So I renamed it and created a new one (about 12 hours for about 400 GB). That went along just fine. For the first few days things were OK. It spun out of control when the upgrade to 11.1 (and hence a large change that needed to be backed up) came: backups could not be completed during the day, and at night (despite of power nap) they’d eventually get interrupted, so that on the next day they needed to get continued. When now triggering a time machine backup it takes more than an hour before the actual backup starts (sizing etc.), and when in progress it is painfully slow.
It looks like what really steals the time are all the small files, stuff under /usr/local (brew) and preferences under ~/Library. When tracing the time machine logs I can see that it does around “~- MB/s, 1.49 items/s”. As a consequence, the backup never catches up with the changes I produce when using my machine during the day (like Emails coming in, caches changed etc.).
I have noticed that during backup a directory ‘/Volumes/Backups of
Of course I could do another backup from the scratch, but I feel pretty certain that after that I will eventually end up with the same problem I have now.
Since the initial backup is reasonably fast I don’t think that my SMB connection to the NAS is the problem here. But something is definitely wrong. Anyone got an idea?
P.S.: as recommended by Synology I have set “signing_required=no” in /etc/nsmb.conf long time ago and never had to change it. Also yesterday I tried to speed up SMB by setting “com.apple.desktopservices DSDontWriteNetworkStores” to “TRUE”. Neither helps.