Backups, storage and moving

x4u backs up your library each week. In Settings → Backups you can back up now and download a copy. On the other computer, install x4u, then use Restore from a file. If your videos are in different places there, choose Find it beside each folder in Settings. Thumbnails and previews are made again there.

Besides your videos, x4u keeps a short preview of each (about half a megabyte), its timeline thumbnails (about as much again), thumbnails, covers, and performers' photos and studios' logos from StashDB. It keeps all of them, so its data grows with your library: a few gigabytes for ten thousand videos. Settings → Storage shows how much each part takes and how much room is left on the drive. When there's less than 5 GB left, x4u says so across the top of every page.

In Settings → Storage, choose Move to another drive, then the drive (or a folder on it). x4u puts its data in an x4u folder there: it copies everything, checks the copy, and restarts from there, then deletes the old copy. It takes a minute or two per few gigabytes; leave x4u open meanwhile. Shortcuts and starting at sign-in keep working, and your videos stay where they are. If that drive isn't connected when x4u starts, x4u asks you to connect it rather than start an empty library; plug it in and start x4u again.

Close x4u, replace its files with the new version's, and start it again. Your library is kept separately, and x4u backs it up before any update changes how it's stored.

First turn off starting x4u when you sign in, in Settings → Starting x4u, so nothing is left trying to start it. Then quit x4u and delete its folder. Your library, thumbnails and backups are kept separately, in the data folder shown in Settings → Storage; delete that too to remove everything (and if you moved it to another drive, the x4u folder in its usual place as well, which only remembers where it went). Your videos aren't touched either way.