Depends on when the survey project has been deleted. This is 3 months after your last login to the survey project. From that point of time on, we store backups (on www.soscisurvey.de) for 12 months.
It seems like you have removed the survey administration period from all the old projects. If you told me which project you're talking about, I can check the deletion date in the server logfiles. The chances for a project that is older than 2 years are, of course, very limited. It would have been necessary that you logged in several times in 2019 and 2020.