I have a few recurring tasks like watering our plants in every week. If I forget

Question

I have a few recurring tasks like watering our plants in every week. If I forget to water them on Monday and do it on Friday I should not water them again on the next Monday, it should be on the next Friday (+7 days).

The same is true, for example, for charging unused batteries in every six months. If I forget to do it and I do it in March instead of January it is unnecessary to charge them again in July (January + 6 months), I'm good with September (March + 6 months).

So missing a due date usually is not a big problem, keeping the interval between the actions is more important. I would like a reminder software which supports this use-case.

Must:

remember completion dates of tasks
have an "I have done it a minute ago" function which schedules the next action according to the completion date
run offline, store data offline
support Linux (Debian/Ubuntu)

Optional:

email notification

Explanation / Answer

Getting Things GNOME! (GTG) is a personal tasks and TODO-list items organizer for the GNOME desktop environment inspired by the Getting Things Done (GTD) methodology.
Recurring tasks can be set and there is "Send task via email" plugin for GTG.

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