You really shouldn’t if that’s a major concern for you and that is a valid concern. For the same reason I’ll never use PurelyMail otherwise it’s perfect.

I know you didn’t ask me — but I don’t think Colin can answer differently other than saying that he is training a family member or friend to take over if needed.

Here’s more https://news.ycombinator.com/item?id=7514753 this is also linked there http://mail.tarsnap.com/tarsnap-users/msg00846.html

Very old threads but I am not sure much has changed there https://www.tarsnap.com/contact.html

Why would you use it instead of restic? Well, for pricing in pico dollars ;-)

and for it has a functional GUI with tiny system footprint and that there really aren’t many such solutions out there.