Nintendo has given a statement to IGN stating that Switch Online service will keep save files for up to 180 days (6 months) after subscription ends.
"If a Nintendo Switch Online membership expires, users won’t be able to access their Save Data Cloud backups. However, Nintendo will allow users who resubscribe within 180 days to access their previous Save Data Cloud backups," the Nintendo spokesperson said.
Source: http://www.ign.com/articles/2018/09...-after-your-switch-online-subscription-lapses
"If a Nintendo Switch Online membership expires, users won’t be able to access their Save Data Cloud backups. However, Nintendo will allow users who resubscribe within 180 days to access their previous Save Data Cloud backups," the Nintendo spokesperson said.
Source: http://www.ign.com/articles/2018/09...-after-your-switch-online-subscription-lapses