The Apple Photos app provides an easy way to download all your data.
Select the files you want to export (Command + A to select them all), and click on File > Export > Export Unmodified Originals.
In the dialog that pops up, select File Name as Sequential and provide any prefix you'd like. This ensures that the photo and video portions of your Live Photos are combined correctly.
Finally, choose an export directory and confirm by clicking Export Originals. You will receive a notification from the app once your export is complete.
Now, simply drag and drop the downloaded folders into our desktop app and grab a cup of coffee (or a good night's sleep, depending on the size of your library) while we handle the rest.
Note: If your uploads get interrupted, just drag and drop the folders into the same albums again, and Srarna will ignore already backed up files and upload only the remaining ones.
If you encounter any issues during this migration, please reach out to support@srarna.com and we will be happy to assist you!