noun
relative generation number
Technical computing term. Used in contexts such as version control, backup systems, or data lineage to indicate a generation count relative to a reference point.
バックアップシステムでは、相対世代番号を使って復元ポイントを指定する。
In backup systems, a relative generation number is used to specify a restore point.
Compound of 相対 (relative) + 世代 (generation) + 番号 (number). A straightforward technical term with no obscure historical derivation.