I am getting failed message on pruning with the following settings: -keep 365:365 -keep 30:30 -keep 7:28 -keep 1:1 -a
show_log.txt (61.4 KB)
Log showing chunks already fossilised.
Check job also errors with missing chunks message.
What am I doing wrong?
From your log:
2026-01-16 01:28:20.003 ERROR SNAPSHOT_DELETE Failed to delete the snapshot PMA-Duplicacy-PMADATA at revision 22: URL request 'https://api003.backblazeb2.com/b2api/v1/b2_delete_file_version' returned 401 Access Denied
Failed to delete the snapshot PMA-Duplicacy-PMADATA at revision 22: URL request 'https://api003.backblazeb2.com/b2api/v1/b2_delete_file_version' returned 401 Access Denied
Why Backblaze returning access denied?
- Maybe the key lacks deleteFile capability (how was the key created? Can you inspect keys and confirm? If not, create a new key and ensure deleteFiles capability is present.)
- Maybe object lock is enabled on a bucket?
The failed check is result of failed prune — snapshot file is still present but chunks it refers to have been fossilized.
Backblaze key is fine for deleting but yes we do have object lock in place set to 30 days.
To confirm, check when was the file snapshots/PMA-Duplicacy-PMADATA/22 uploaded on the backblaze side. If it’s les than 30 days – then that’s the answer.
Then adjust your prune policy accordingly. Alternative solution is to avoid object lock and to use two sets of keys as described here How secure is duplicacy? - #30 by tallgrass
Yes, I believe that is the problem. I think it stems from the prune settings:
-keep 365:365 -keep 30:30 -keep 7:28 -keep 1:1 -a
Which translates to:
Keep 1 snapshot every 365 day(s) if older than 365 day(s)
Keep 1 snapshot every 30 day(s) if older than 30 day(s)
Keep 1 snapshot every 7 day(s) if older than 28 day(s)
Keep 1 snapshot every 1 day(s) if older than 1 day(s)
It’s the 7 days if older that 28 that’s the problem I believe? This was to achieve a weekly retention for 4 weeks before monthlies kick in.
I assume I should change that to 7:30 instead?
Remove these completely. You can’t have anything that affects revisions younger than your lock period.
OK, so what pruning commands do I use to achieve the following retention with the Backblaze 30 day object lock in place?:
Every day kept for 30 days (in line with Backblaze object lock)
A weekly for 4 weeks after 30 days
A monthly for 12 months after 30 days
An annual forever