I made some changes to my project – uvi.glitch.me – on Friday that have disappeared. Turns out that’s a big deal in this case and I’m anxious to find out if it’s recoverable somehow. (It’s a paid/boosted project, in case that matters.)
Thanks for any help!
check if it is in your archived projects.
Negative. It’s just the changes from Friday(ish) that disappeared; not the whole project.
contact support@glitch.com
@dreev, can you try rewinding your project?
https://glitch.com/help/how-do-i-rollback-changes-with-rewind/
I had this happen too, but luckily only lost small changes. Sorry to hear about your case!
Whenever I make some changes I now open the terminal and run git add . && git commit -m "m".
Also lost changes I made to one of my projects recently, rewind does not have it saved either unfortunately.
Hi there!
One of my projects got reverted once and the Glitch team got it back in about 24 hours via email support@glitch.com or Happyfox. Please don’t edit the project as this may push backups from Glitch’s server. Contact the team ASAP and allow them 24-48 hours for them to get back to you 
Eddie
UPDATE: I don’t know if the Glitch gods intervened but my project is back to normal!
(I was not having luck with the rewind feature earlier, maybe due to the partial outage / degraded performance of the editor.)
Side note: [moved to “Pretty please prioritize paid plans”]
With this particular issue, that I have experineced before, the whole project, including rewind, gets reverted
Update: this just happened to another of my projects – http://chaosgame.glitch.me – which lost the changes from the last day-ish.
I’ve confirmed that the Rewind feature doesn’t help. 
Email the email listed above or open a support ticket. Support will get back to you by the next business day.