I’ve been using Arq for a number of years since CrashPlan’s demise. Generally it has worked fine. But it seems to have a performance / optimization problem. A typical incremental run can take 10 hours, thought it varies widely. Depending on when the runs take place, the iMac can effectively be backing up ALL THE TIME. And in spite of the options to Throttle Disk I/O and other resources, I almost always have to pause it to keep my iMac from being unusably slow.
Here is a sample run with I/O throttling DISABLED:
20-Sep-2021 08:00:05 EDT Backup activity started
20-Sep-2021 08:00:05 EDT Arq version 7.7.2
20-Sep-2021 08:00:05 EDT macOS 11.6
20-Sep-2021 08:00:05 EDT Storage location: AWS (S3:/akiauenjtrxfwvdeqwuf-arq)
20-Sep-2021 08:00:05 EDT Backup plan: Back up to AWS (D2758EBB-E649-4832-AE6D-XXX)
20-Sep-2021 08:00:05 EDT Preventing computer sleep while backing up
20-Sep-2021 08:00:31 EDT Creating APFS snapshot for Macintosh HD - Data (/System/Volumes/Data)
20-Sep-2021 08:00:31 EDT Created APFS snapshot for Macintosh HD - Data (/System/Volumes/Data)
20-Sep-2021 10:18:43 EDT /Users: Created a new backup record.
20-Sep-2021 10:18:43 EDT /Users: 482.871 GB, 1,067,779 files backed up
20-Sep-2021 10:46:46 EDT /Volumes/Photos Image 2: Created a new backup record.
20-Sep-2021 10:46:46 EDT /Volumes/Photos Image 2: 1,391.454 GB, 369,503 files backed up
20-Sep-2021 10:46:46 EDT Total scanned: 1,874.325 GB, 1,437,298 files
20-Sep-2021 10:46:46 EDT Total uploaded (compressed): 2.371 GB, 2054 files
20-Sep-2021 10:46:46 EDT Thinning backup records according to backup plan settings.
20-Sep-2021 10:46:47 EDT Thinning backup records: Deleting backup record 2021-08-19 09:21:10 +0000
20-Sep-2021 10:46:48 EDT Thinning backup records: Deleting backup record 2021-08-19 06:08:51 +0000
20-Sep-2021 10:46:48 EDT Removing unreferenced data
20-Sep-2021 10:47:39 EDT Total stored size before cleanup: 2,029.852 GB
20-Sep-2021 18:08:55 EDT Total stored size after cleanup: 2,027.527 GB
20-Sep-2021 18:08:55 EDT Removing APFS snapshot for /System/Volumes/Data
20-Sep-2021 18:08:55 EDT Removed APFS snapshot for /System/Volumes/Data
20-Sep-2021 18:08:56 EDT Backup activity ended
It has a “thinning” process which keeps hourly backups for 24 hours, daily backups for 30 days, etc. But when it actually goes to purge the linked data blocks, the process I believe they call “cleanup”, it spends an inordinate amount of time. (CPU and Network and memory do not appear to be busy during this operation).
I have been working with the developer, but I’m not optimistic he will be able to fix it.
So now I’m considering alternatives, and BackBlaze appears to be the favorite child these days. Yes?
As such, can anyone provide performance data about how BB handles, say 1-2TB of data into the Cloud? (Eg, how many hours a day is it running, how does it affect system performance, etc?)
Thanks in advance!