David Wright <deb...@lionunicorn.co.uk> writes: > > Just guessing. You set the cron job to initiate a backup at 04:00. > Perhaps there's something configured in your /etc/btrbk/btrbk.conf > that says check for retention by day/week/month/year rather than > 04:00/day/week/month/year. The former check has to made at midnight. > Nope. btrbk is very simple, it just checks what snapshots are already there, and if there is already a snapshot in your snapshot directory of the form <subvolume>.<YYYYMMDD> it just adds a snapshot <subvolume>.<YYYYMMDD>_<Sequence number>.
Otherwise it just completes its entire run, creating snapshots, and sending the diffs between snapshots to a backup destination at whatever time you run it. And the logs show a full run at 00:00, when there is nothing configured to kick that off. And if I activate that 04:00 cronjob, I get two full runs in my logs, with the attendant <YYYYMMDD>_1 snapshots in my snapshot directory. Mart -- "We will need a longer wall when the revolution comes." --- AJS, quoting an uncertain source.
