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A comment on APFS changes in Big Sur: how Time Machine backs up to APFS. Parent comment
I don't know, but you can trigger backups on demand using tmutil(8), and that's what I do.
> And if you do say 3 backups then get rid of #3, can it take incremental #4 on top of #2, or will it complain that the #3 state it expects is absent?
You can delete arbitrary backup(s). "Classic" Time Machine backups are snapshots deduped using hard links. HFS+ even supports directory hard links.
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I don't know, but you can trigger backups on demand using tmutil(8), and that's what I do.
> And if you do say 3 backups then get rid of #3, can it take incremental #4 on top of #2, or will it complain that the #3 state it expects is absent?
You can delete arbitrary backup(s). "Classic" Time Machine backups are snapshots deduped using hard links. HFS+ even supports directory hard links.