I’ve been thinking of self hosting a mastodon (gotosocial, more specifically) + a matrix server on an old computer I have, but sometimes I might need to turn it off for 2 days or more (not to mention some energy or internet outages that might happen here)
I suppose with the mastodon part the server will properly sync and download whatever’s been missing, but I’m not entirely sure that’ll be the case with matrix. If anyone sent me a DM on there while my server was down, would it get through after it was back up?
No. There’s nothing for people to connect to when it’s shutdown. And requests or submissions would just get bounced back by the server not existing.
I think they are asking about a personal instance, not something federated necessarily. A lag server.