Keeper.sh copies events from one month back to two years ahead, unless you change that. The range is called the sync window. It sits under Sync Window on the calendar receiving the events, and covers everything copied into it.
The two settings you change
Sync Historic Events sets how far into the past copies reach, one month by default. Sync Future Events sets how far ahead, two years by default. Each takes one of six spans: 1 week, 1 month, 3 months, 6 months, 12 months, or 2 years.
An event outside the range is not copied, however recently it was created. Choosing a span is a Pro feature. On Free the defaults hold, and the dashboard says so where the setting would be.
Narrowing a range removes events
This is the part worth reading twice. Narrowing a range does not just stop new copies outside it. Copies already in the calendar that now fall outside are removed too, because the range describes what the calendar should contain.
Widening works the other way. Events in the newly covered span arrive on the next check, so give it a few minutes before deciding something is wrong. Sending events to another calendar covers the timings.
If events you expected have gone missing, copied events have disappeared from the other calendar starts from that symptom.
Choosing a range
A short future range keeps a shared or work calendar tidy. Next year's provisional plans stay out of it. A long historic range suits the calendar you search through for what you did and when.
Every event inside the range is a real event in the receiving calendar. A wide range on a busy calendar is a lot of events. If that calendar is only ever read, a shareable calendar link may fit better: one link rather than thousands of copies.
Where to go next
- Sending events to another calendar — how the copying works
- What a copied event shows — which details travel with the copy
- Recipes — complete setups that use these settings together