I've set up a test instance of lemmy with a recent backup restored (backups are each over 200GB because of the image cache) and am preparing to test the update to lemmy 0.19 and pictrs 0.5.
I'm thinking I might do the 0.19 first, then once others have updated to pictrs 0.5 and it's going OK then I'll give it a go in the test instance. The pictrs update is what I've been waiting for, which let's us set an expiry of the image cache (currently lemmy had all images ever cached still in the cache, in full resolution).
The lemmy 0.19 update shouldn't take long, but the pictrs one will take a while I believe as it's got some sort of database migration to do.
Anyone got any objection to having lemmy.nz updated to 0.19 later this week? It might break apps that haven't been updated in a while, but that is inevitable anyway.