noun
scheduled maintenance
Primarily used in computing and engineering for planned, periodic maintenance of systems, equipment, or software.
サーバーの定期保守は毎週日曜日の深夜に行われます。
Scheduled maintenance of the server is performed late every Sunday night.
定期保守のお知らせが届いた。
A notice of scheduled maintenance arrived.
Compound of 定期 (periodic) and 保守 (maintenance). A straightforward Sino-Japanese technical term.