Seeing a picture in Snapchat does not establish that it has finished backing up. Before signing out, moving to another phone or reinstalling, check the status that Snapchat provides for Memories. This is a small step with a clear purpose: confirm that the material you expect to keep has reached its intended backup.
Where is the status?
Snapchat’s Memories backup instructions direct users from Settings to My App under Apps & Privacy, then Memories. Check Backup Progress. The result you are looking for is “Complete.” Menu placement can change, so the linked support page is the reference if your interface differs.
A remaining-Snaps count or a network message means the operation is unfinished. Keep the source device available, establish a working connection and check again after the transfer has had time to complete. Do not treat the absence of a dramatic error as equivalent to a successful backup.
Does that also protect the camera roll?
Snapchat explicitly says it does not back up camera-roll media to Memories. These are separate collections. Decide where each important photo or video actually lives before relying on a backup status from a different collection.
A useful habit is to name the location when discussing a missing item: saved in Memories, present in the phone’s photo library, or visible in a conversation. “My photos disappeared” leaves too many possible storage locations unresolved.
What should happen before a device change?
Check progress while the original installation is still usable. Snapchat warns that Memories which never successfully backed up cannot be recovered after they are lost. Avoid using sign-out or deletion as the first troubleshooting step when the backup is incomplete.
If progress stalls, record the exact status and whether the connection works. Share those observations with support rather than private images. Once the destination is working, inspect the memories you expected to find before retiring the old setup.