olemus
(1) jäädvustatud hetkeolek,
millesse saab vajadusel naasta,
näiteks arvutisüsteemis, programmis, andmebaasis

Wiktionary:
2. (computing) a situation, often represented by a point in time, at which the state of a database system is known to be valid, and to which it can be returned in the event of a crisis by using a combination of backups and logs; the data stored at this event
After the crash, we rolled back the database to the last checkpoint.

https://en.wikipedia.org/wiki/Application_checkpointing
https://en.wikipedia.org/wiki/Transaction_processing_system#Recovery_process

(2) mehitatud kontrollimiskoht,
näiteks piiripunkt, pääsla vm

Wiktionary:
1. a point or place where a check is performed, especially a point along a road or on a frontier where travellers are stopped for inspection
The travellers were stopped at the checkpoint.

https://en.wikipedia.org/wiki/Border_checkpoint
https://en.wikipedia.org/wiki/Security_checkpoint
https://en.wikipedia.org/wiki/Random_checkpoint
https://en.wikipedia.org/wiki/Weigh_station