Periodic Snapshot Tasks not deleting as per schedule

TrueNAS General
1

After doing several upgrades up to 25.10 several of my periodic snapshot tasks are not deleting expired snapshots as indicated by their description

Used:
2.12 MiB
Date created:
2025-10-17 00:00:00
Referenced:
1.09 GiB
Retention:
Will be automatically destroyed at 2025-11-16 00:00:00 by periodic snapshot task

I have hourly backup tasks set that need to be manually purged because suddenly TrueNAS doesn’t delete them as per the schedule which is 1 day.

The dataset and snapshots are replicated but the replication job is set to follow the snapshot schedule.

2

Did you get to the bottom of this?

I’m currently investigating the same problem, snapshots aren’t being cleaned up after their retention period, just tried updating to 25.10.1 which doesn’t look like it has fixed it.

3

Sort of. I ended up going in and manually cleaning up old snapshots that should have been deleted. It seems to be working after the cleanup.

4

Yeah I just so happened to log on in the middle of my vm and apps ssds replicating to my main pool and was shocked to see they had over 400 and 500 snapshots respectively. These are small 256gb m2s with 3 vms on one and 26 apps on the other, and a 1 week lifetime. Checking the snapshots there are some that are months old that list a correct deletion date of 1 week after creation, but they clearly were never cleaned up in the past nor caught my the system any time afterwards.

5

One thing to be aware of - are you replicating to other systems and the replications have been paused due to network errors, or whatever? That can be an issue if you elected in the replication menu to retain snapshots past their normal expiry date if they haven’t been transferred yet.