If you moved to a new phone and still have your old device with your 1SE on it, you can easily back up and restore your videos by subscribing to the Pro plan.
On the other hand, if you restored your phone or moved to a new one and no longer have your old device, subscribing to the Pro plan will not allow you to recover all your snippets, since they were never stored on our servers.
Your subscription will allow you to safely back up your snippets from now on in case you change phones again or your device is damaged.