KopiaUI starting two snapshots instead of one per hour

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Kopia v0.10.7 running on macOS 11.6.4.

I have KopiaUI running with a policy that snapshots a directory hourly to a mounted NAS volume.

Sometimes it runs two snapshots (right after each other) each hour instead of one. It looks like a snapshot is started one second before the hour, and then perhaps tries to start a second snapshot exactly on the hour but that second one waits until the first has completed (~1-3 minutes):

image
image182×881 27.3 KB

Some hours are fine, e.g. 10:00 to 14:00 today saw just one per hour. Some other periods it does this almost every hour.

The global policy has no scheduled snapshots, and this path has an hourly schedule. No other policies for this repo, and no manual or cron-scheduled kopia CLI jobs either. Only one instance of the kopia process is running.

Global policy:

{
    "retention": {
        "keepLatest": 10,
        "keepHourly": 48,
        "keepDaily": 7,
        "keepWeekly": 4,
        "keepMonthly": 24,
        "keepAnnual": 30
    },
    "files": {
        "ignore": [
 ...
        ],
        "ignoreDotFiles": [
            ".kopiaignore"
        ]
    },
    "errorHandling": {
        "ignoreFileErrors": false,
        "ignoreDirectoryErrors": false,
        "ignoreUnknownTypes": true
    },
    "scheduling": {},
    "compression": {
        "compressorName": "zstd-best-compression"
    },
    "actions": {},
    "logging": {
        "directories": {
            "snapshotted": 5,
            "ignored": 5
        },
        "entries": {
            "snapshotted": 0,
            "ignored": 5,
            "cacheHit": 0,
            "cacheMiss": 0
        }
    },
    "upload": {
        "maxParallelSnapshots": 1
    }
}

This path’s policy:

{
    "retention": {},
    "files": {},
    "errorHandling": {},
    "scheduling": {
        "intervalSeconds": 3600
    },
    "compression": {},
    "actions": {},
    "logging": {
        "directories": {},
        "entries": {}
    },
    "upload": {}
}

Any ideas? Thanks!