Intervals, totals

11. Intervals between auto backups. T2M2 calculates the time periods between the start of each consecutive automatic backup during the period of analysis. If only one auto backup has been started, no figure is given. There will be one less interval than the number of auto backups started. These should be around 60 minutes, and are again reported in whole minutes (ignoring the decimal). If they range widely, with some less than 50 and others more than 70 minutes, suspect a scheduling problem, which is usually fixed by restarting your Mac. The result might read

intervals between the start of each auto backup were 57.0 minutes.

If the last of these intervals is longer than 90 minutes, T2M2 should automatically run checks of the systems which schedule backups. They should also be run if

- no backup has been started during the period of analysis, and

- no backup has been completed during the period of analysis, and

- no auto or manual backup is still in progress, and

- the period of the analysis is 2 hours or more.

12. Backups created and deleted. This gives a summary total for all the new backups created over the period, and old ones deleted. The former should of course match the number in 4 above. If it doesn't, then you need to look for a reason. This is given simply as

Created 2 new backups, and deleted 2 old backups,

13. Snapshots created and deleted (not Sierra). This gives a summary total for all the new local snapshots created over the period, and old ones deleted. When backing up APFS volumes, High Sierra and later make local snapshots as well. These figures give the numbers, which should normally be one created and one deleted with each hourly backup. This is given simply as

Created 2 new snapshots, and deleted 2 old snapshots,

➜ Deep traversal

➜ Interpret result

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